VANGUARD BALANCED INDEX FUND INC
497, 2000-04-12
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM N-1A

     REGISTRATION STATEMENT (NO. 33-48863) UNDER THE SECURITIES ACT OF 1933

                           PRE-EFFECTIVE AMENDMENT NO.
                         POST-EFFECTIVE AMENDMENT NO. 13

                                       AND

         REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
                                AMENDMENT NO. 15


                          VANGUARD BALANCED INDEX FUND
         (EXACT NAME OF REGISTRANT AS SPECIFIED IN DECLARATION OF TRUST)

                      P.O. BOX 2600, VALLEY FORGE, PA 19482
                     (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)

                          REGISTRANT'S TELEPHONE NUMBER
                                 (610) 669-1000

                           R. GREGORY BARTON, ESQUIRE
                                  P.O. BOX 876
                             VALLEY FORGE, PA 19482

                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
   AS SOON AS PRACTICABLE AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.

               IT IS PROPOSED THAT THIS FILING BECOME EFFECTIVE:
            ON APRIL 7, 2000, PURSUANT TO PARAGRAPH (B) OF RULE 485.
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                                                       VANGUARD(R)
                                                       BALANCED INDEX
                                                       FUND

                                                       Prospectus
                                                       April 7, 2000

This prospectus contains
financial data for the
Fund through the
fiscal year ended
December 31, 1999.

                                                       [A MEMBER OF
                                                       THE VANGUARD GROUP(R)]
<PAGE>

VANGUARD BALANCED INDEX FUND
Prospectus
April 7, 2000

A Balanced Mutual Fund

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CONTENTS
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 1 FUND PROFILE                              18 FINANCIAL HIGHLIGHTS

 3 ADDITIONAL INFORMATION                    20 INVESTING WITH VANGUARD

 4 AN INTRODUCTION TO INDEX FUNDS               20 Services and Account Features

 5 A WORD ABOUT RISK                            21 Types of Accounts

 5 WHO SHOULD INVEST                            22 Buying Shares

 6 PRIMARY INVESTMENT STRATEGIES                24 Redeeming Shares

13 THE FUND AND VANGUARD                        28 Transferring Registration

14 INVESTMENT ADVISER                           28 Fund and Account Updates

15 DIVIDENDS, CAPITAL GAINS, AND TAXES       GLOSSARY (inside back cover)

17 SHARE PRICE
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WHY READING THIS PROSPECTUS IS IMPORTANT
This  prospectus  explains the  objective,  risks,  and  strategies  of Vanguard
Balanced  Index Fund. To highlight  terms and concepts  important to mutual fund
investors,  we have provided "Plain Talk(R)" explanations along the way. Reading
the prospectus will help you to decide whether the Fund is the right  investment
for you. We suggest that you keep it for future reference.
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NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
<PAGE>

                                                                               1

FUND PROFILE

The following profile summarizes key features of Vanguard Balanced Index Fund.

INVESTMENT OBJECTIVE
The Fund seeks to provide  current  income  and  long-term  growth of income and
capital.

INVESTMENT STRATEGIES
The Fund typically  invests 60% of its assets in common stocks and 40% in bonds.
The stock  portion of the Fund seeks to match the total  return of the  Wilshire
5000 Total Market Index, a widely recognized  measure for the U.S. stock market.
The Fund's bond portion  seeks to replicate  the returns of the Lehman  Brothers
Aggregate  Bond Index,  a measure of  regularly  traded,  U.S.  investment-grade
bonds. There is no assurance that the Fund will achieve its stated objective.

PRIMARY RISKS
THE FUND'S TOTAL RETURN,  LIKE STOCK AND BOND PRICES  GENERALLY,  WILL FLUCTUATE
WITHIN A WIDE  RANGE,  SO AN  INVESTOR  COULD LOSE MONEY OVER SHORT OR EVEN LONG
PERIODS.  The Fund is also subject to:
- -    Stock  market  risk,  which is the chance that stock prices in general will
     decline  over  short or even long  periods.  The stock  market  tends to be
     cyclical,  with periods when stock prices  generally  rise and periods when
     stock prices generally decline.
- -    Interest  rate risk,  which is the chance  that bond  prices  overall  will
     decline  over  short or even long  periods  due to rising  interest  rates.
     Interest rate risk should be moderate for the Fund.
- -    Income risk, which is the chance that falling interest rates will cause the
     Fund's income to decline. Income risk should be moderate for the Fund.
- -    Credit  risk,  which is the  chance  that a bond  issuer  will  fail to pay
     interest and  principal  in a timely  manner,  reducing the Fund's  return.
     Credit risk should be low for the Fund.

- -    Prepayment  risk,  which is the  chance  that  during  periods  of  falling
     interest rates, a mortgage-backed  bond issuer will repay a higher-yielding
     bond before its maturity date because the  underlying  mortgages  have been
     paid off ahead of  schedule.  If a bond is called,  the Fund would lose the
     opportunity  for  additional  price  appreciation,  and  would be forced to
     reinvest the  unanticipated  proceeds at lower interest rates. As a result,
     the Fund would experience a decline in income.

- -    Index sampling risk,  which is the chance that the securities  selected for
     the Fund  will not  provide  investment  performance  matching  that of the
     index. Index sampling risk for the Fund should be low.

PERFORMANCE/RISK INFORMATION
The bar chart and table below  provide an indication of the risk of investing in
the Fund. The bar chart shows the Fund's performance in each calendar year since
inception.  The table shows how the Fund's  average annual total returns for one
and five calendar  years and since  inception  compare to those of a broad-based
securities  market index. Keep in mind that the Fund's past performance does not
necessarily indicate how it will perform in the future.
<PAGE>

2

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                              ANNUAL TOTAL RETURNS
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                                 1993    10.00%
                                 1994    -1.56%
                                 1995    28.64%
                                 1996    13.95%
                                 1997    22.24%
                                 1998    17.85%
                                 1999    13.61%
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Total return figures do not reflect the annual account maintenance fee of $10.
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     During the period shown in the bar chart, the highest return for a calendar
quarter was 12.67% (quarter ended December 31, 1998) and the lowest return for a
quarter was -5.57% (quarter ended September 30, 1998).

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          AVERAGE ANNUAL TOTAL RETURNS FOR YEARS ENDED DECEMBER 31, 1999
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                                                                    SINCE
                                        1 YEAR      5 YEARS       INCEPTION*
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Vanguard Balanced Index Fund**          13.61%       19.13%         14.89%
Balanced Composite Index+               13.54        19.30          15.19
Wilshire 5000 Index                     23.77        27.11          20.92
Lehman Brothers Aggregate Bond Index    -0.82         7.73           6.57
- --------------------------------------------------------------------------------
 *November 9, 1992.
**Total return figures do not reflect the annual account maintenance fee of $10.
 +Made up of two unmanaged benchmarks,  weighted 60% Wilshire 5000 Index and 40%
  Lehman Brothers Aggregate Bond Index.
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FEES AND EXPENSES
The following  table  describes the fees and expenses you may pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1999.

      SHAREHOLDER FEES (fees paid directly from your investment)
      Sales Charge (Load) Imposed on Purchases:                          None
      Transaction Fee on Purchases:                                      None
      Sales Charge (Load) Imposed on Reinvested Dividends:               None
      Redemption Fee:                                                    None
      Exchange Fee:                                                      None
      Account Maintenance Fee (for accounts under $10,000)      $2.50/quarter*

      ANNUAL FUND OPERATING EXPENSES (expenses deducted from the Fund's
      assets)
      Management Expenses:                                              0.17%
      12b-1 Distribution Fee:                                            None
      Other Expenses:                                                   0.03%
        TOTAL ANNUAL FUND OPERATING EXPENSES:                           0.20%

    *The  account   maintenance   fee  will  be  deducted  from  your  quarterly
    distribution of the Fund's dividends.  If your distribution is less than the
    fee,  fractional  shares  will  be  automatically  redeemed  to  make up the
    difference.
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                                                                               3

     The Fund  reserves the right to deduct a  transaction  fee of 0.08% from an
investor's cumulative purchases over $100 million.  Where it applies, the fee is
retained  by the  Fund to  offset  transaction  costs  of  investing  large  new
contributions  into the  market.  The fee is not paid to  Vanguard  and is not a
sales charge.

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                                PLAIN TALK ABOUT
                                  FUND EXPENSES
All mutual funds have operating  expenses.  These  expenses,  which are deducted
from a fund's gross  income,  are expressed as a percentage of the net assets of
the fund.  Vanguard  Balanced Index Fund's expense ratio in fiscal year 1999 was
0.20%, or $2 per $1,000 of average net assets.  The average balanced mutual fund
had  expenses  in 1999 of 1.33%,  or $13.30  per  $1,000 of  average  net assets
(derived  from data  provided by Lipper Inc.,  which  reports on the mutual fund
industry).  Management  expenses,  which  are one  part of  operating  expenses,
include investment advisory fees as well as other costs of managing a fund--such
as account maintenance,  reporting,  accounting, legal, and other administrative
expenses.
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     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical  expenses  that you would incur over various  periods if you invest
$10,000 in the Fund.  This example assumes that the Fund provides a return of 5%
a year, and that operating  expenses  remain the same. The results apply whether
or not you redeem your investment at the end of each period.

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             1 YEAR         3 YEARS         5 YEARS         10 YEARS
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              $20             $64             $113            $255
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     THIS  EXAMPLE  SHOULD NOT BE  CONSIDERED  TO REPRESENT  ACTUAL  EXPENSES OR
PERFORMANCE  FROM THE PAST OR FOR THE  FUTURE.  ACTUAL  FUTURE  EXPENSES  MAY BE
HIGHER OR LOWER THAN THOSE SHOWN.

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ADDITIONAL INFORMATION

DIVIDENDS AND CAPITAL GAINS               MINIMUM INITIAL INVESTMENT
Dividends are distributed quarterly       $3,000; $1,000 for IRAs and custodial
in March, June, September, and            accounts for minors
December; capital gains, if any, are
distributed annually in December          NEWSPAPER ABBREVIATION
                                          Balanced
INVESTMENT ADVISER
The Vanguard Group, Inc., Valley Forge,   VANGUARD FUND NUMBER
Pa., since inception                      02

INCEPTION DATE                            CUSIP NUMBER
November 9, 1992                          921931101

NET ASSETS AS OF DECEMBER 31, 1999        TICKER SYMBOL
$3.1 billion                              VBINX

SUITABLE FOR IRAS
Yes
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<PAGE>

4

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                                PLAIN TALK ABOUT
                             THE COSTS OF INVESTING
Costs are an important  consideration in choosing a mutual fund.  That's because
you, as a shareholder,  pay the costs of operating a fund,  plus any transaction
costs  associated with the fund's buying and selling of securities.  These costs
can erode a substantial  portion of the gross income or capital  appreciation  a
fund achieves. Even seemingly small differences in expenses can, over time, have
a dramatic effect on a fund's performance.
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AN INTRODUCTION TO INDEX FUNDS

WHAT IS INDEXING?
An index is an unmanaged group of securities  whose overall  performance is used
as a standard to measure the investment  performance of a particular  market. An
index (or "passively managed") fund tries to match, as closely as possible,  the
performance of an established  target index.  The fund does this by holding all,
or a representative sample, of the securities that comprise the index.
     The target  index may be a group of stocks or bonds,  or a  combination  of
stocks and bonds. Balanced index funds hold a mix of stocks and bonds.
     Index funds do not have active managers who buy and sell  securities  based
on research  and  analysis.  Rather,  index funds are  passively  managed by the
adviser who seeks to match a market benchmark.

WHY INVEST IN INDEX FUNDS?
Index funds appeal to many investors for a number of reasons:
- -    Variety of  investments.  Vanguard index funds  generally  invest in a wide
     variety of companies and industries.
- -    Relative consistency.  Because they seek to track market benchmarks,  index
     funds by definition  should not perform  dramatically  better or worse than
     their benchmarks.
- -    Low cost.  Index funds are  inexpensive  to run as compared  with  actively
     managed funds.  They have lower  research costs and keep trading  activity,
     and thus trading costs, to a minimum.
- -    Low  realization  of capital gains.  Because an index fund typically  sells
     securities only to respond to redemption requests or to adjust its holdings
     to reflect a change in its target index, the fund's turnover rate--and thus
     its realization of taxable capital gains--is usually very low.

     KEEP IN MIND THAT AN INDEX  FUND HAS  OPERATING  EXPENSES  AND  TRANSACTION
COSTS;  A MARKET INDEX DOES NOT.  THEREFORE,  AN INDEX  FUND--WHILE  EXPECTED TO
TRACK ITS TARGET INDEX AS CLOSELY AS POSSIBLE--WILL TYPICALLY BE UNABLE TO MATCH
THE PERFORMANCE OF THE INDEX EXACTLY.
<PAGE>

                                                                               5

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A WORD ABOUT RISK

This  prospectus  describes  risks you would  face as an  investor  in  Vanguard
Balanced  Index Fund.  It is important to keep in mind one of the main axioms of
investing: The higher the risk of losing money, the higher the potential reward.
The  reverse,  also,  is  generally  true:  The lower  the  risk,  the lower the
potential  reward.  As you consider an investment  in the Fund,  you should also
take into account your  personal  tolerance  for the daily  fluctuations  of the
stock and bond markets.
     Look for this [FLAG] symbol  throughout the prospectus.  It is used to mark
detailed  information  about  each  type of risk that you  would  confront  as a
shareholder of the Fund.
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WHO SHOULD INVEST

The Fund may be a suitable investment for you if:
- -    You are seeking  moderate  current income and long-term growth of principal
     and income.
- -    You are seeking a diversified combination of U.S. stocks and bonds.
- -    You are willing to invest for the long term--at least five years.

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                                PLAIN TALK ABOUT
                             COSTS AND MARKET-TIMING
Some   investors  try  to  profit  from   market-timing--switching   money  into
investments  when they  expect  prices to rise,  and taking  money out when they
expect  the  market  to fall.  As money is  shifted  in and out,  a fund  incurs
expenses  for buying and selling  securities.  These costs are borne by all fund
shareholders,  including the long-term  investors who do not generate the costs.
Therefore,  the Fund  discourages  short-term  trading by,  among other  things,
limiting the number of exchanges it permits.
- --------------------------------------------------------------------------------

     THE VANGUARD FUNDS DO NOT PERMIT MARKET-TIMING.  DO NOT INVEST IN THIS FUND
IF YOU ARE A MARKET-TIMER.

The Fund has  adopted  the  following  policies,  among  others,  to  discourage
short-term  trading:
- -    The Fund  reserves  the right to  reject  any  purchase  request--including
     exchanges from other  Vanguard  funds--that it regards as disruptive to the
     efficient  management  of the Fund.  A purchase  request  could be rejected
     because  of the  timing  of the  investment  or  because  of a  history  of
     excessive trading by the investor.
- -    Telephone and online exchanges are not accepted for non-IRA accounts.
- -    There is a limit on the  number of times you can  exchange  into and out of
     the Fund (see "Redeeming Shares" in the INVESTING WITH VANGUARD section).
- -    The Fund reserves the right to stop offering shares at any time.
<PAGE>

6

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                                PLAIN TALK ABOUT
                                 BALANCED FUNDS
Balanced  funds are  generally  "middle  of the road"  investments  that seek to
provide some  combination  of growth,  income,  and  conservation  of capital by
investing in a mix of stocks,  bonds, and/or money market  instruments.  Because
the prices of stocks  and bonds  often move in  different  directions,  balanced
funds are able to use  rewards  from one type of  investment  to help offset the
risks from another.
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PRIMARY INVESTMENT STRATEGIES

This section explains the strategies that the investment adviser uses in pursuit
of the Fund's  objective--current  income and  long-term  growth of capital  and
income.  It also  explains  how the  adviser  implements  these  strategies.  In
addition,  this section discusses several  important  risks--stock  market risk,
interest rate risk,  income risk,  credit risk,  and  prepayment  risk--faced by
investors  in the  Fund.  The  Fund's  Board of  Trustees,  which  oversees  the
management of the Fund, may change the Fund's investment objective or strategies
in the interest of shareholders, without a shareholder vote.

MARKET EXPOSURE

STOCKS
About 60% of the Fund's assets are invested in common  stocks,  in an attempt to
replicate  with that portion of the assets the  performance of the Wilshire 5000
Index.

[FLAG] THE FUND IS SUBJECT TO STOCK MARKET RISK,  WHICH IS THE CHANCE THAT STOCK
     PRICES OVERALL WILL DECLINE OVER SHORT OR EVEN LONG PERIODS.  STOCK MARKETS
     TEND TO MOVE IN  CYCLES,  WITH  PERIODS  OF RISING  PRICES  AND  PERIODS OF
     FALLING PRICES.

     To illustrate the volatility of stock prices, the following table shows the
best,  worst,  and average total returns for the U.S.  stock market over various
periods as measured by the Standard & Poor's 500 Index,  a widely used barometer
of market  activity.  (Total returns  consist of dividend  income plus change in
market  price.)  Note that the returns  shown do not include the costs of buying
and selling  stocks or other  expenses  that a real-world  investment  portfolio
would  incur.  Note,  also,  that the gap between best and worst tends to narrow
over the long term.  (The S&P 500 Index is shown here  because  this  benchmark,
unlike the Wilshire 5000 Index, has been in existence for all of the periods
shown.)

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                     U.S. STOCK MARKET RETURNS (1926-1999)
- --------------------------------------------------------------------------------
                                1 YEAR     5 YEARS     10 YEARS     20 YEARS
- --------------------------------------------------------------------------------
Best                             54.2%      28.6%        19.9%        17.9%
Worst                           -43.1      -12.4         -0.9          3.1
Average                          13.2       11.0         11.1         11.1
- --------------------------------------------------------------------------------

     The table  covers all of the 1-, 5-,  10-,  and 20-year  periods  from 1926
through 1999. You can see, for example,  that while the average return on common
stocks for all of the 5-year periods was 11.0%,  returns for  individual  5-year
periods ranged from a -12.4% average
<PAGE>

                                                                               7

(from 1928  through  1932) to 28.6%  (from 1995  through  1999).  These  average
returns reflect past performance on common stocks; you should not regard them as
an indication of future  returns from either the stock market as a whole or this
Fund in particular, which invests approximately 40% of its assets in bonds.
     While the Fund's holdings will typically  include the 500 largest stocks in
the  Wilshire  5000 Index,  they will not include all of the  securities  in the
Index. Instead, the Fund will invest in a representative sample of stocks.
     Keep in mind,  too,  that while the  Wilshire  5000 Index is  dominated  by
large-cap  stocks  (those  contained  in the S&P 500 Index),  small- and mid-cap
issues are also represented. The Fund's stock holdings are adjusted on a regular
basis to reflect the Wilshire 5000 Index. As of December 31, 1999,  about 22.16%
of the market value of the Wilshire 5000 Index was comprised of securities  that
were not in the S&P 500 Index.  Stocks of smaller  companies  have  historically
been more volatile than--and at times have performed quite differently from--the
stocks of larger companies.

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                                PLAIN TALK ABOUT
                    LARGE-CAP, MID-CAP, AND SMALL-CAP STOCKS
Stocks  of  publicly  traded   companies--and   mutual  funds  that  hold  these
stocks--can be classified by the  companies'  market value,  or  capitalization.
Market  capitalization  changes over time, and there is no "official" definition
of the boundaries of large-,  mid-,  and small-cap  stocks.  Vanguard  generally
defines  large-capitalization  (large-cap)  funds as  those  holding  stocks  of
companies  whose  outstanding  shares have a market value exceeding $12 billion;
mid-cap funds as those holding  stocks of companies  with a market value between
$1 billion and $12  billion;  and  small-cap  funds as those  typically  holding
stocks  of  companies  with a market  value of less  than $1  billion.  Vanguard
periodically reassesses these classifications.
- --------------------------------------------------------------------------------

BONDS

About 40% of the Fund's assets are invested in bonds, in an attempt to replicate
with that portion of the assets the performance of the Lehman Brothers Aggregate
Bond Index.


[FLAG] THE FUND IS SUBJECT TO INTEREST RATE RISK,  WHICH IS THE CHANCE THAT BOND
     PRICES  OVERALL  WILL DECLINE OVER SHORT OR EVEN LONG PERIODS DUE TO RISING
     INTEREST RATES. INTEREST RATE RISK SHOULD BE MODERATE FOR SHORTER-TERM BOND
     FUNDS AND HIGH FOR  LONGER-TERM  BOND FUNDS.  BECAUSE THE FUND INVESTS IN A
     PORTFOLIO OF BONDS WITH AN  INTERMEDIATE  AVERAGE  MATURITY  (5-10  YEARS),
     INTEREST RATE RISK IS MODERATE.
<PAGE>

8

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                            BONDS AND INTEREST RATES
As a rule,  when  interest  rates rise,  bond prices fall.  The opposite is also
true:  Bond  prices go up when  interest  rates  fall.  Why do bond  prices  and
interest  rates move in opposite  directions?  Let's assume that you hold a bond
offering a 5% yield. A year later,  interest rates are on the rise and bonds are
offered with a 6% yield. With  higher-yielding  bonds available,  you would have
trouble selling your 5% bond for the price you  paid--causing  you to lower your
asking  price.  On the other hand,  if interest  rates were falling and 4% bonds
were  being  offered,  you should be able to sell your 5% bond for more than you
paid.
- --------------------------------------------------------------------------------

     Although  bonds are often thought to be less risky than stocks,  there have
been periods when bond prices have fallen  significantly  due to rising interest
rates.  For  instance,  prices of  long-term  bonds fell by almost  48%  between
December 1976 and September 1981.
     To illustrate the volatility of bond prices,  the following table shows the
effect of both a 1% and a 2%  change  (both up and  down) in  interest  rates on
three bonds of different maturities, each with a face value of $1,000.

- --------------------------------------------------------------------------------
                      HOW INTEREST RATE CHANGES AFFECT THE
                             VALUE OF A $1,000 BOND*
- --------------------------------------------------------------------------------
                              AFTER A 1%   AFTER A 1%   AFTER A 2%    AFTER A 2%
TYPE OF BOND (MATURITY)        INCREASE     DECREASE     INCREASE      DECREASE
- --------------------------------------------------------------------------------
Short-Term (2.5 years)           $978        $1,023        $956         $1,046
Intermediate-Term (10 years)      932         1,074         870          1,156
Long-Term (20 years)              901         1,116         816          1,251
- --------------------------------------------------------------------------------
*Assumes a 7% yield.
- --------------------------------------------------------------------------------

     These  figures are for  illustration  only and should not be regarded as an
indication  of  future  returns  from the bond  market as a whole or the Fund in
particular.
     Changes in interest rates will affect bond income as well as bond prices.

[FLAG] THE FUND IS SUBJECT  TO INCOME  RISK,  WHICH IS THE CHANCE  THAT A FUND'S
     DIVIDENDS (INCOME) WILL DECLINE DUE TO FALLING INTEREST RATES.  INCOME RISK
     IS  GENERALLY  THE GREATEST FOR  SHORT-TERM  BOND FUNDS,  AND THE LEAST FOR
     LONG-TERM BOND FUNDS.

[FLAG] BECAUSE  IT  INVESTS  IN  MORTGAGE-BACKED  BONDS,  THE FUND IS SUBJECT TO
     PREPAYMENT  RISK,  WHICH IS THE  CHANCE  THAT  DURING  PERIODS  OF  FALLING
     INTEREST  RATES, A  MORTGAGE-BACKED  BOND ISSUER WILL  "CALL"--OR  REPAY--A
     HIGHER-YIELDING  BOND BEFORE ITS MATURITY  DATE.  IF A BOND IS CALLED,  THE
     FUND WOULD LOSE THE  OPPORTUNITY  FOR ADDITIONAL  PRICE  APPRECIATION,  AND
     WOULD BE FORCED TO REINVEST THE UNANTICIPATED  PROCEEDS AT A LOWER INTEREST
     RATE. AS A RESULT, THE FUND WOULD EXPERIENCE A DECLINE IN INCOME.

     Since the Fund  invests  only a portion  of its  assets in  mortgage-backed
bonds, the risk to the Fund is limited.
<PAGE>

                                                                               9

[FLAG] THE FUND IS  SUBJECT  TO CREDIT  RISK,  WHICH IS THE  CHANCE  THAT A BOND
     ISSUER WILL FAIL TO PAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.

     The credit quality of the Fund is expected to be very high, and thus credit
risk should be low. The weighted  average credit quality of the Fund's holdings,
as rated by Moody's Investors Service, as of December 31, 1999, was Aa1.
     To a limited extent,  the Fund is also exposed to event risk,  which is the
chance  that  corporate  fixed-income  securities  held by the Fund may suffer a
substantial  decline  in credit  quality  and  market  value due to a  corporate
restructuring or other corporate event.
     Finally,  because stock and bond prices often move in different directions,
the Fund's bond holdings help to dampen--but  not  eliminate--some  of the stock
market volatility  experienced by the Fund. Likewise,  changes in interest rates
may not have as  dramatic  an effect on the Fund as they would on a fund made up
entirely of bonds.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                 BOND MATURITIES
A bond is issued with a specific  maturity  date--the date when the bond issuer,
or seller,  must pay back the bond's  initial value (known as its "face value").
Bond maturities generally range from less than one year (short-term) to 30 years
(long-term).  The  longer  a  bond's  maturity,  the more  risk  you,  as a bond
investor,  face as interest  rates  rise--but  also the more  interest you could
receive. Long-term bonds are more suitable for investors willing to take greater
risks in hopes of higher yields;  short-term bond investors should be willing to
accept  lower  yields  in  return  for less  fluctuation  in the  value of their
investment.
- --------------------------------------------------------------------------------

SECURITY SELECTION

INDEXING METHODS
In  seeking  to track a  particular  index,  a fund may use one of two  indexing
methods to select the stocks or bonds it invests in.
     Some index funds hold each stock or bond found in their  target  indexes in
about  the same  proportions  as  represented  in the  indexes  themselves.  For
example,  if 5% of the S&P 500 Index  were  made up of the  stock of a  specific
company,  a fund tracking that index would invest about 5% of its assets in that
company.

     Other index funds may use a different  selection process.  Because it would
be impractical to buy and sell all of the securities  represented  (the Wilshire
5000 Index,  for  example,  included  more than 7,000  stocks as of December 31,
1999),  many funds  tracking  these larger  indexes use a "sampling"  technique.
Using a sophisticated  computer program, these funds select securities that will
recreate   their  target   indexes  in  terms  of  industry,   size,  and  other
characteristics. For instance, if 10% of the Wilshire 5000 Index were made up of
utility  stocks,  the Balanced  Index Fund would allocate about 10% of its stock
investment to the utility stocks of the index with similar characteristics.


[FLAG] THE FUND IS SUBJECT TO INDEX SAMPLING RISK,  WHICH IS THE CHANCE THAT THE
     SECURITIES SELECTED WILL NOT PROVIDE INVESTMENT  PERFORMANCE  MATCHING THAT
     OF THE TARGET INDEXES. INDEX SAMPLING RISK SHOULD BE LOW.
<PAGE>

10

STOCKS
The Fund's common stock portfolio is designed to have investment characteristics
that  parallel  those  of the  Wilshire  5000  Index.  The Fund is  expected  to
replicate  approximately  1,000 of the largest  securities  in the Wilshire 5000
Index as measured by market capitalization,  plus a representative sample of the
remainder,  which are selected primarily on the basis of market  capitalization,
industry weightings, and other fundamental characteristics.  Typically, the Fund
holds a total of between 3,000 and 3,500 stocks.

BONDS
The Fund's bond portfolio is designed to have  investment  characteristics  that
parallel   those  of  the  Lehman   Brothers   Aggregate  Bond  Index,  a  broad
market-weighted  index that encompasses  five major classes of  investment-grade
fixed-income   securities  in  the  United  States:  U.S.  Treasury  and  agency
securities,   corporate   bonds,   mortgage-backed   securities,   international
dollar-denominated  bonds, and asset-backed  securities with maturities  greater
than one year. The Fund will invest in a  representative  sample of fixed-income
securities  in the  index,  which,  taken  together,  are  expected  to  perform
similarly to the index. These securities are described further as follows:
- -    U.S.  government  securities  include U.S. Treasury and agency bonds, which
     represent  loans by an investor to the U.S.  Treasury  Department or a wide
     variety of governmental agencies and  instrumentalities.  Timely payment of
     principal  and interest on these bonds is  guaranteed by the full faith and
     credit of the U.S. government; some agency bonds have the same guarantee.
- -    Corporate bonds are IOUs issued by businesses that want to borrow money for
     some  purpose--often to develop a new product or service,  to expand into a
     new market,  or to buy another  company.  As with other types of bonds, the
     issuer  promises  to repay the  principal  on a  specific  date and to make
     interest  payments in the meantime.  The amount of interest offered depends
     both on market  conditions and on the financial  health of the  corporation
     issuing the bonds; a company whose credit rating is not strong will have to
     offer a relatively high interest rate to obtain buyers for its bonds.
- -    Mortgage-backed  securities  represent  interests  in  underlying  pools of
     mortgages.  Unlike  ordinary  bonds,  which  generally  pay a fixed rate of
     interest  at regular  intervals  and then repay  principal  upon  maturity,
     mortgage-backed  bonds pay both  interest  and  principal  as part of their
     regular payments. Because the mortgages underlying the bonds can be prepaid
     at any time by homeowners or corporate borrowers, mortgage-backed bonds are
     subject to prepayment risk, as discussed earlier in this prospectus.  These
     types of bonds are issued by a number of government agencies, including the
     Government  National  Mortgage  Association  (GNMA),  often  referred to as
     "Ginnie  Mae," the Federal  Home Loan  Mortgage  Corporation  (FHLMC),  the
     Federal National Mortgage  Association (FNMA), often referred to as "Fannie
     Mae," and the Federal Housing Authority (FHA). GNMA bonds are guaranteed by
     the full faith and credit of the U.S.  government as to the timely  payment
     of principal and interest;  bonds issued by other  government  agencies are
     not.  (Note:  The  Balanced  Index  Fund may also  invest  in  conventional
     mortgage-backed securities,  which are packaged by private corporations and
     are not guaranteed by the U.S. government.)
- -    International  dollar-denominated  bonds  are  bonds  denominated  in  U.S.
     dollars issued by foreign  governments  and  companies.  Because the bond's
     value is designated in dollars  rather than in the currency of the issuer's
     country,  the investor is not exposed to currency risk;  rather, the issuer
     assumes the risk, usually to attract U.S. investors.
<PAGE>

                                                                              11

- -    Asset-backed  securities  are bonds backed by an underlying  pool of assets
     such as automobile loans,  credit card loans, and home equity loans.  These
     securities are structured  with varying  amounts of credit risk,  depending
     primarily  on the  quality of the  underlying  assets.  They are  generally
     issued  by  private  corporations  and  are  not  guaranteed  by  the  U.S.
     government.  Asset-backed bonds are subject to prepayment risk as discussed
     earlier in this prospectus.

     In "sampling" its target index,  the Fund has the flexibility to overweight
particular types of bonds relative to their  representation  in the index.  This
normally involves substituting  corporate bonds for government bonds of the same
maturity.  The corporate  substitution strategy increases the Fund's income, but
also marginally increases exposure to credit risk, which is explained on page 9.
The Fund limits corporate  substitutions to bonds with less than approximately 4
years' remaining  maturity,  and the Fund will limit corporate  substitutions to
approximately 15% of its net assets.

     The Fund is generally managed without regard to tax ramifications.

FUND CHARACTERISTICS

STOCKS
The following table provides a snapshot of some financial characteristics of the
Fund's stock holdings as of December 31, 1999.

- --------------------------------------------------------------------------------
         PRICE/EARNINGS      EARNINGS       DIVIDEND       PRICE/BOOK
              RATIO         GROWTH RATE      YIELD           RATIO
- --------------------------------------------------------------------------------
              27.40           17.30%         1.10%            5.00
- --------------------------------------------------------------------------------

- -    Price/earnings  ratio  is the  current  price of a  stock,  divided  by its
     per-share  earnings  (profits) from the past year. A stock selling for $20,
     with earnings of $2 per share, has a price/earnings ratio of 10.
- -    Earnings growth rate is the average annual rate, expressed as a percentage,
     of growth in  earnings  over the past five  years for the  stocks  now in a
     fund.
- -    Dividend  yield is current  income  (interest  or  dividends)  earned by an
     investment, expressed as a percentage of the investment's price.
- -    Price/book ratio is the current price of a stock, divided by its net worth,
     or book  value,  per  share.  For a fund,  this  ratio  is used to mean the
     weighted average price/book ratio of the stocks held by the fund.

BONDS
The following table provides a snapshot of the financial  characteristics of the
Fund's bond holdings as of December 31, 1999.

- --------------------------------------------------------------------------------
           NUMBER OF          AVERAGE        AVERAGE         AVERAGE
            ISSUES            MATURITY       QUALITY         DURATION
- --------------------------------------------------------------------------------
              449             9 years          Aa1           5 years
- --------------------------------------------------------------------------------

- -    Number of issues is an  indicator  of  diversification.  The more  separate
     issues a fund holds, the less susceptible it is to a price decline stemming
     from the problems of a particular issue.
<PAGE>

12

- -    30-day yield is a snapshot of a fund's  income.  The yield,  expressed as a
     percentage  of the fund's net asset value,  is based on its income,  net of
     its  operating  expenses,  over  the  past 30 days  and is  annualized,  or
     projected forward for the coming year.
- -    Average  maturity is the average  length of time until bonds held by a fund
     reach maturity (or are called) and are repaid.  In general,  the longer the
     average maturity,  the more a fund's share price will fluctuate in response
     to changes in market interest rates.
- -    Weighted average quality is an indicator of credit risk. This figure is the
     average  of  the  ratings  assigned  to a  fund's  securities  holdings  by
     credit-rating  agencies.  The agencies make their judgment after appraising
     an issuer's ability to meet its obligations.  Quality is graded on a scale,
     with Aaa or AAA  indicating the most  creditworthy  bond issuers and A-1 or
     MIG-1 indicating the most creditworthy  issuers of money market securities.
     The Fund's  weighted  average  quality is based on the market  value of the
     bonds held by the Fund.
- -    Average  duration is an estimate of how much a bond fund's share price will
     fluctuate in response to a change in interest  rates.  To see how the price
     could  shift,  multiply  the fund's  duration  by the  change in rates.  If
     interest rates rise by one percentage point, the share price of a fund with
     an  average  duration  of five  years  would  decline by about 5%. If rates
     decrease by a percentage  point, the fund's share price would rise by about
     5%.

TURNOVER RATE
Although the Fund  generally  seeks to invest for the long term,  it retains the
right to sell  securities  regardless of how long the securities have been held.
The Fund's average  turnover rate for the past five years has been about 25%. (A
turnover  rate of 100% would occur,  for example,  if the Fund sold and replaced
securities valued at 100% of its total net assets within a one-year period.)

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  TURNOVER RATE
Before  investing in a mutual fund,  you should review its turnover  rate.  This
gives an  indication  of how  transaction  costs could affect the fund's  future
returns.  In general,  the greater the volume of buying and selling by the fund,
the greater the impact that brokerage  commissions and other  transaction  costs
will have on its return. Also, funds with high turnover rates may be more likely
to generate  capital gains that must be  distributed to  shareholders  as income
subject to taxes.  As of December 31, 1999,  the average  turnover  rate for all
domestic   hybrid  funds  (a  category   that  includes   balanced   funds)  was
approximately 95%, according to Morningstar, Inc.
- --------------------------------------------------------------------------------

ACCOUNT MAINTENANCE FEE
Vanguard assesses an account  maintenance fee on index fund  shareholders  whose
account  balances are below $10,000 (for any reason,  including a decline in the
value of the Fund's shares) on the date a dividend is  distributed.  This fee is
intended to allocate the costs of  maintaining  accounts  more  equitably  among
shareholders.  The account  maintenance fee is $2.50 per quarter,  deducted from
the quarterly  dividend,  which usually is distributed during the last two weeks
of  each  calendar   quarter.   If  the  fee  is  deducted  from  your  dividend
distribution,  you will  still be taxed  on the  full  amount  of your  dividend
(unless you hold your shares  through a  nontaxable  account).  If you are due a
dividend that
<PAGE>

                                                                              13

is less than the fee,  fractional shares will be automatically  redeemed to make
up the difference. This fee cannot be prepaid.

OTHER INVESTMENT POLICIES AND RISKS
Besides  investing in U.S.  common  stocks and bonds,  the Fund may make certain
other  kinds of  investments  to achieve its  objective.  The Fund may invest in
fixed-income  securities not in the target index  (non-public,  investment grade
securities--generally  referred to as 144A securities--as well as smaller public
issues or medium term notes not  included in the index due to their  size).  The
vast majority of these securities will have characteristics and risks similar to
those in the target index.  The Fund may also purchase money market  instruments
and certain  derivatives  in order to manage cash flow into and out of the Fund,
reduce  transaction  costs,  or add value when these  instruments  are favorably
priced.
     The Fund may invest, to a limited extent, in foreign securities.

     The Fund may also invest,  to a limited  extent,  in stock and bond futures
and options  contracts,  which are traditional types of derivatives.  Losses (or
gains)  involving  futures  can  sometimes  be  substantial--in  part  because a
relatively small price movement in a futures contract may result in an immediate
and  substantial  loss (or gain) for a fund.  This Fund will not use futures for
speculative  purposes  or as  leveraged  investments  that  magnify the gains or
losses of an  investment.  The Fund's  obligation to purchase  securities  under
futures contracts will not exceed 20% of its total assets.

     The reasons for which the Fund will invest in futures and options are:
- -    To keep cash on hand to meet  shareholder  redemptions or other needs while
     simulating full investment in stocks and bonds.
- -    To reduce the Fund's  transaction costs or add value when these instruments
     are favorably priced.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                   DERIVATIVES
A derivative is a financial contract whose value is based on (or "derived" from)
a  traditional  security  (such  as a stock  or a  bond),  an  asset  (such as a
commodity like gold), or a market index (such as the S&P 500 Index). Futures and
options are derivatives  that have been trading on regulated  exchanges for more
than two decades.  These  "traditional"  derivatives are standardized  contracts
that can easily be bought and sold,  and whose market values are  determined and
published  daily. It is these  characteristics  that  differentiate  futures and
options from the relatively new types of derivatives. If used for speculation or
as leveraged investments, derivatives can carry considerable risks.
- --------------------------------------------------------------------------------


THE FUND AND VANGUARD

The Fund is a member of The Vanguard  Group, a family of more than 35 investment
companies  with more than 100 funds holding assets worth more than $540 billion.
All of the  Vanguard  funds  share  in the  expenses  associated  with  business
operations, such as personnel, office space, equipment, and advertising.
     Vanguard  also  provides   marketing   services  to  the  funds.   Although
shareholders do not pay sales commissions or 12b-1  distribution fees, each fund
pays its allocated share of The Vanguard Group's marketing costs.
<PAGE>

14

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                      VANGUARD'S UNIQUE CORPORATE STRUCTURE
The Vanguard Group is truly a MUTUAL mutual fund company. It is owned jointly by
the funds it oversees and thus  indirectly by the  shareholders  in those funds.
Most other mutual funds are operated by for-profit management companies that may
be owned by one person,  by a group of individuals,  or by investors who own the
management  company's stock. By contrast,  Vanguard  provides its services on an
"at-cost"  basis,  and the funds' expense  ratios  reflect only these costs.  No
separate  management  company reaps profits or absorbs losses from operating the
funds.
- --------------------------------------------------------------------------------


INVESTMENT ADVISER

The Vanguard Group (Vanguard), P.O. Box 2600, Valley Forge, PA 19482, founded in
1975,  serves as the Fund's adviser through its Core Management and Fixed Income
Groups.  As of the fiscal  year ended  December  31,  1999,  Vanguard  served as
adviser  for about  $371.4  billion in assets.  Vanguard  manages the Fund on an
at-cost basis,  subject to the control of the Trustees and officers of the Fund.
For the fiscal year ended December 31, 1999, the  investment  advisory  expenses
represented an effective annual rate of approximately 0.01%.
     The adviser is authorized to choose  brokers-dealers to handle the purchase
and sale of the Fund's securities,  and to seek out the best available price and
most  favorable  execution for all  transactions.  Also, the Fund may direct the
adviser to use a  particular  broker for certain  transactions  in exchange  for
commission rebates or research services provided to the Fund.
     In the interest of obtaining better execution of a transaction, the adviser
may at times  choose  brokers who charge  higher  commissions.  If more than one
broker can obtain the best available  price and most favorable  execution,  then
the adviser is  authorized  to choose a broker who, in addition to executing the
transaction, will provide research services to the adviser or the Fund.
<PAGE>

                                                                              15

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                               THE FUND'S ADVISER
The individuals primarily responsible for overseeing the Fund's investments are:

GEORGE U.  SAUTER,  Managing  Director of Vanguard and head of  Vanguard's  Core
Management  Group;  has worked in  investment  management  since  1985;  primary
responsibility  for  Vanguard's  stock indexing  investment  policy and strategy
since joining the company in 1987;  has served as the portfolio  manager for the
stock portion of the Fund since  inception;  A.B.,  Dartmouth  College;  M.B.A.,
University of Chicago.

IAN A.  MACKINNON,  Managing  Director of Vanguard and head of Vanguard's  Fixed
Income  Group;  has  worked  in  investment   management  since  1974;   primary
responsibility for Vanguard's  internal  fixed-income  policy and strategy since
joining the company in 1981; has been  responsible  for overseeing the portfolio
management  of the bond  portion of the Fund since  inception;  B.A.,  Lafayette
College; M.B.A., Pennsylvania State University.


FELIX B. LIM, has worked in investment management since completing his education
in 1996;  joined  Vanguard in January  1999;  worked as a credit  analyst  until
January 2000; B.A. and M.S., University of Pennsylvania (Wharton School).

- --------------------------------------------------------------------------------


DIVIDENDS, CAPITAL GAINS, AND TAXES

FUND DISTRIBUTIONS
The Fund  distributes to shareholders  virtually all of its net income (interest
and dividends,  less  expenses),  as well as any capital gains realized from the
sale of its holdings. Income dividends generally are distributed in March, June,
September,  and  December;   capital  gains  distributions  generally  occur  in
December.   In  addition,   the  Fund  may  occasionally  be  required  to  make
supplemental  dividend or capital gains  distributions at some other time during
the year. You can receive  distributions of income dividends or capital gains in
cash, or you can have them automatically reinvested in more shares of the Fund.

BASIC TAX POINTS
Vanguard will send you a statement  each year showing the tax status of all your
distributions.  In addition,  taxable investors should be aware of the following
basic tax points:
- -    Distributions are taxable to you for federal income tax purposes whether or
     not you reinvest these amounts in additional Fund shares.
- -    Distributions   declared  in  December--if  paid  to  you  by  the  end  of
     January--are  taxable  for  federal  income tax  purposes as if received in
     December.
- -    Any dividends and short-term  capital gains that you receive are taxable to
     you as ordinary income for federal income tax purposes.
- -    Any  distributions  of net  long-term  capital  gains are taxable to you as
     long-term capital gains for federal income tax purposes, no matter how long
     you've owned shares in the Fund.
- -    Capital gains  distributions  may vary  considerably from year to year as a
     result of the Fund's normal investment activities and cash flows.
<PAGE>

16

- -    A sale or exchange of Fund shares is a taxable  event.  This means that you
     may have a capital gain to report as income, or a capital loss to report as
     a deduction, when you complete your federal income tax return.
- -    Dividend and capital gains  distributions that you receive, as well as your
     gains or losses from any sale or exchange of Fund shares, may be subject to
     state and local income taxes.

GENERAL INFORMATION
BACKUP  WITHHOLDING.   By  law,  Vanguard  must  withhold  31%  of  any  taxable
distributions or redemptions from your account if you do not:
- -    provide us with your correct taxpayer identification number;
- -    certify that the taxpayer identification number is correct; and
- -    confirm that you are not subject to backup withholding.
Similarly,  Vanguard  must withhold from your account if the IRS instructs us to
do so.
FOREIGN  INVESTORS.  The Vanguard funds  generally do not offer their shares for
sale outside of the United States.  Foreign  investors should be aware that U.S.
withholding and estate taxes may apply to any investments in Vanguard funds.
INVALID  ADDRESSES.  If a dividend or capital gains distribution check mailed to
your address of record is returned as undeliverable, Vanguard will automatically
reinvest  all future  distributions  until you  provide us with a valid  mailing
address.
TAX CONSEQUENCES.  This prospectus provides general tax information only. If you
are investing through a tax-deferred retirement account, such as an IRA, special
tax rules apply. Please consult your tax adviser for detailed  information about
a fund's tax consequences for you.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  DISTRIBUTIONS
As a  shareholder,  you are  entitled  to your share of the fund's  income  from
interest and dividends, and gains from the sale of investments. You receive such
earnings as either an income  dividend or a capital gains  distribution.  Income
dividends come from both the dividends that the fund earns from its holdings and
the  interest it receives  from its money market and bond  investments.  Capital
gains are realized  whenever the fund sells securities for higher prices than it
paid for them. These capital gains are either short-term or long-term, depending
on whether the fund held the  securities  for one year or less, or more than one
year.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                               "BUYING A DIVIDEND"
Unless you are investing through a tax-deferred  retirement  account (such as an
IRA),  it is not to your  advantage  to buy shares of a fund  shortly  before it
makes a  distribution,  because  doing so can cost you money in  taxes.  This is
known as "buying a dividend."  For example:  on December 15, you invest  $5,000,
buying 250 shares for $20 each. If the fund pays a distribution  of $1 per share
on December 16, its share price would drop to $19 (not counting  market change).
You still have only $5,000 (250 shares x $19 = $4,750 in share  value,  plus 250
shares x $1 = $250 in  distributions),  but you owe tax on the $250 distribution
you  received--even  if you  reinvest  it in more  shares.  To avoid  "buying  a
dividend," check a fund's distribution schedule before you invest.
- --------------------------------------------------------------------------------
<PAGE>

                                                                              17

SHARE PRICE

The Fund's share price,  called its net asset value,  or NAV, is calculated each
business day after the close of regular  trading on the New York Stock  Exchange
(the NAV is not  calculated  on  holidays  or other  days when the  Exchange  is
closed).  Net asset  value per share is computed by adding up the total value of
the Fund's  investments  and other assets,  subtracting  any of its  liabilities
(debts), and then dividing by the number of Fund shares outstanding:

                                  TOTAL ASSETS - LIABILITIES
           NET ASSET VALUE =   -------------------------------
                                 NUMBER OF SHARES OUTSTANDING

     Knowing the daily net asset value is useful to you as a shareholder because
it indicates the current value of your investment. The Fund's NAV, multiplied by
the  number of  shares  you own,  gives you the  dollar  amount  you would  have
received had you sold all of your shares back to the Fund that day.
     A NOTE ON PRICING:  The Fund's  investments  will be priced at their market
value when market  quotations are readily  available.  When these quotations are
not  readily  available,  investments  will  be  priced  at  their  fair  value,
calculated according to procedures adopted by the Fund's Board of Trustees.
     The Fund's  share price can be found  daily in the mutual fund  listings of
most major  newspapers  under the  heading  "Vanguard  Index  Funds."  Different
newspapers use different  abbreviations  of the Fund's name, but the most common
is BALANCED.


FINANCIAL HIGHLIGHTS

The following financial  highlights table is intended to help you understand the
Fund's financial  performance for the past five years,  and certain  information
reflects  financial  results for a single Fund share.  The total  returns in the
table represent the rate that an investor would have earned or lost each year on
an investment  in the Fund  (assuming  reinvestment  of all dividend and capital
gains  distributions).  This  information  has been derived  from the  financial
statements audited by PricewaterhouseCoopers LLP, independent accountants, whose
report--along  with the Fund's financial  statements--is  included in the Fund's
most recent annual report to  shareholders.  You may have the annual report sent
to you without charge by contacting Vanguard.
<PAGE>

18

- --------------------------------------------------------------------------------
                                            VANGUARD BALANCED INDEX FUND
                                               YEAR ENDED DECEMBER 31,
                                       -----------------------------------------
                                         1999     1998    1997     1996    1995
- --------------------------------------------------------------------------------
NET ASSET VALUE, BEGINNING OF YEAR     $18.48   $16.29  $13.92   $12.77  $10.34
- --------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income                    .58      .54    .520      .50     .45
 Net Realized and Unrealized Gain
   (Loss) on Investments                 1.88     2.33   2.525     1.26    2.48
                                       -----------------------------------------
   Total from Investment Operations      2.46     2.87   3.045     1.76    2.93
                                       -----------------------------------------
DISTRIBUTIONS
 Dividends from Net Investment Income    (.58)    (.54)  (.530)    (.49)   (.45)
 Distributions from Realized Capital
   Gains                                 (.14)    (.14)  (.145)    (.12)   (.05)
                                       -----------------------------------------
   Total Distributions                   (.72)    (.68)  (.675)    (.61)   (.50)
- --------------------------------------------------------------------------------
NET ASSET VALUE, END OF YEAR           $20.22   $18.48  $16.29   $13.92  $12.77
================================================================================
TOTAL RETURN*                          13.61%   17.85%  22.24%   13.95%  28.64%
================================================================================
RATIOS/SUPPLEMENTAL DATA
 Net Assets, End of Year (Millions)    $3,128   $2,004  $1,260     $826    $590
 Ratio of Total Expenses to
   Average Net Assets                   0.20%    0.21%   0.20%    0.20%   0.20%
 Ratio of Net Investment Income to
   Average Net Assets                   3.18%    3.29%   3.56%    3.69%   3.85%
 Turnover Rate                            29%      25%     18%    37%**     16%
================================================================================
 *Total return figures do not reflect the annual account maintenance fee of $10.
**Turnover rate excluding in-kind redemptions was 30%.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                   HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE

The Fund began  fiscal 1999 with a net asset value  (price) of $18.48 per share.
During  the  year,  the Fund  earned  $0.58  per share  from  investment  income
(interest  and  dividends)  and  $1.88  per  share  from  investments  that  had
appreciated  in value or that were sold for higher prices than the Fund paid for
them.

Shareholders  received $0.72 per share in the form of dividend and capital gains
distributions.  A portion of each year's  distributions  may come from the prior
year's income or capital gains.

The  earnings  ($2.46  per  share)  minus the  distributions  ($0.72  per share)
resulted in a share price of $20.22 at the end of the year.  This was a increase
of $1.74 per share (from  $18.48 at the  beginning  of the year to $20.22 at the
end of the year).  For a shareholder  who  reinvested the  distributions  in the
purchase of more shares, the total return from the Fund was 13.61% for the year.

As of December 31, 1999, the Fund had $3.1 billion in net assets.  For the year,
its  expense  ratio  was  0.20%  ($2  per  $1,000  of net  assets);  and its net
investment  income  amounted to 3.18% of its  average  net  assets.  It sold and
replaced securities valued at 29% of its net assets.
- --------------------------------------------------------------------------------

"Standard & Poor's(R),"  "S&P(R),"  "S&P  500(R),"  "Standard & Poor's 500," and
"500" are trademarks of The McGraw-Hill Companies, Inc.
<PAGE>

                                                                              19

- --------------------------------------------------------------------------------
INVESTING WITH VANGUARD

Are you looking for the most  convenient  way to open or add money to a Vanguard
account?  Obtain instant access to fund information?  Establish an account for a
minor child or for your retirement savings?
     Vanguard  can help.  Our goal is to make it easy and pleasant for you to do
business with us.
     The following  sections of the prospectus briefly explain the many services
we offer.  Booklets providing detailed information are available on the services
marked with a [BOOKLET]. Please call us to request copies.
- --------------------------------------------------------------------------------


SERVICES AND ACCOUNT FEATURES

Vanguard  offers many services that make it convenient to buy, sell, or exchange
shares, or to obtain fund or account information.
- --------------------------------------------------------------------------------
TELEPHONE REDEMPTIONS (SALES AND EXCHANGES)
Automatically set up for this Fund unless you notify us otherwise.

Note: Limitations do apply; see page 24.

- --------------------------------------------------------------------------------
VANGUARD(R) DIRECT DEPOSIT SERVICE [BOOKLET]
Automatic  method  for  depositing  your  paycheck  or U.S.  government  payment
(including Social Security and government pension checks) into your account.
- --------------------------------------------------------------------------------
VANGUARD(R) AUTOMATIC EXCHANGE SERVICE [BOOKLET]
Automatic  method for  moving a fixed  amount of money  from one  Vanguard  fund
account to another.
- --------------------------------------------------------------------------------
VANGUARD FUND EXPRESS(R) [BOOKLET]
Electronic  method for buying or selling shares.  You can transfer money between
your  Vanguard  fund account and an account at your bank,  savings and loan,  or
credit union on a systematic schedule.
- --------------------------------------------------------------------------------
VANGUARD DIVIDEND EXPRESS(TM) [BOOKLET]
Electronic method for transferring  dividend and/or capital gains  distributions
directly  from your  Vanguard  fund account to your bank,  savings and loan,  or
credit union account.
- --------------------------------------------------------------------------------
VANGUARD TELE-ACCOUNT(R) 1-800-662-6273 (ON-BOARD) [BOOKLET]
Toll-free  24-hour access to Vanguard fund and account  information--as  well as
some  transactions--by  using any touch-tone phone.  Tele-Account provides total
return,  share price, price change, and yield quotations for all Vanguard funds;
gives your account balances and history (e.g., last transaction, latest dividend
distribution);  and  allows  you to sell or  exchange  shares  to and from  most
Vanguard funds.
- --------------------------------------------------------------------------------
ACCESS VANGUARD(TM) www.vanguard.com [COMPUTER]
You can use your  personal  computer to perform  certain  transactions  for most
Vanguard  funds by accessing our website.  To establish  this service,  you must
register  through our website.  We will then mail you an account access password
that  allows  you  to  process  the  following   financial  and   administrative
transactions online:
- -    Open a new account.*
- -    Buy, sell, or exchange shares of most funds.
- -    Change your name/address.
<PAGE>

20

- -    Add/change fund options (including dividend options, Vanguard Fund Express,
     bank instructions,  checkwriting, and Vanguard Automatic Exchange Service).
     (Some  restrictions may apply.) Please call our Client Services  Department
     for assistance.

*Only current Vanguard shareholders can open a new account online, by exchanging
 shares from other existing Vanguard accounts.
- --------------------------------------------------------------------------------
INVESTOR INFORMATION DEPARTMENT: 1-800-662-7447 (SHIP) TEXT TELEPHONE:
1-800-952-3335
Call  Vanguard for  information  on our funds,  fund  services,  and  retirement
accounts, and to request literature.
- --------------------------------------------------------------------------------
CLIENT SERVICES DEPARTMENT: 1-800-662-2739 (CREW) TEXT TELEPHONE: 1-800-749-7273
Call Vanguard for information on your account, account transactions, and account
statements.
- --------------------------------------------------------------------------------
SERVICES  FOR  CLIENTS  OF  VANGUARD'S  INSTITUTIONAL  DIVISION:  1-888-809-8102
Vanguard's  Institutional  Division offers a variety of specialized services for
large  institutional   investors,   including  the  ability  to  effect  account
transactions through private electronic networks and third-party recordkeepers.
- --------------------------------------------------------------------------------


TYPES OF ACCOUNTS

Individuals and institutions can establish a variety of accounts with Vanguard.
- --------------------------------------------------------------------------------
FOR ONE OR MORE PEOPLE
Open an account in the name of one (individual) or more (joint tenants) people.
- --------------------------------------------------------------------------------
FOR HOLDING PERSONAL TRUST ASSETS [BOOKLET]
Invest assets held in an existing personal trust.
- --------------------------------------------------------------------------------
FOR INDIVIDUAL RETIREMENT ACCOUNTS [BOOKLET]
Open a  traditional  IRA account or a Roth IRA  account.  Eligibility  and other
requirements  are  established  by federal law and  Vanguard  custodial  account
agreements. For more information, please call 1-800-662-7447 (SHIP).
- --------------------------------------------------------------------------------
FOR AN ORGANIZATION [BOOKLET]
Open an account as a corporation,  partnership,  endowment, foundation, or other
entity.
- --------------------------------------------------------------------------------
FOR THIRD-PARTY TRUSTEE RETIREMENT INVESTMENTS
Open an account as a retirement trust or plan based on an existing  corporate or
institutional  plan.  These  accounts  are  established  by the  trustee  of the
existing plan.
- --------------------------------------------------------------------------------
VANGUARD PROTOTYPE PLANS
Open a  variety  of  retirement  accounts  using  Vanguard  prototype  plans for
individuals,  sole proprietorships,  and small businesses. For more information,
please call 1-800-662-2003.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
A NOTE ON INVESTING WITH VANGUARD THROUGH OTHER FIRMS
You may purchase or sell Fund shares through a financial  intermediary such as a
bank,  broker,  or investment  adviser.  If you invest with Vanguard  through an
intermediary,  please read that firm's program  materials  carefully to learn of
any  special  rules  that may apply.  For  example,  special  terms may apply to
additional service features, fees, or other policies.  Consult your intermediary
to determine when your order will be priced.
- --------------------------------------------------------------------------------
<PAGE>

                                                                              21

BUYING SHARES

You buy your shares at the Fund's next-determined net asset value after Vanguard
receives your request.  As long as your request is received  before the close of
trading on the New York Stock Exchange,  generally 4 p.m. Eastern time, you will
buy your shares at that day's net asset value.
- --------------------------------------------------------------------------------
MINIMUM INVESTMENT TO . . .
open a new account
$3,000 (regular account); $1,000 (traditional IRAs and Roth IRAs).

add to an existing account
$100 by mail or exchange; $1,000 by wire.
- --------------------------------------------------------------------------------
A NOTE ON LOW BALANCES
The Fund  reserves  the  right to close any  nonretirement  fund  account  whose
balance falls below the minimum initial  investment.  The Fund will deduct a $10
annual fee in June if your  nonretirement  account balance at that time is below
$2,500.  The low balance fee is waived for investors who have aggregate Vanguard
account assets of $50,000 or more.
- --------------------------------------------------------------------------------
BY MAIL TO . . . [ENVELOPE]
open a new account
Complete and sign the account registration form and enclose your check.

add to an existing account
Mail your check with an  Invest-By-Mail  form  detached  from your  confirmation
statement to the address listed on the form. Please do not alter  Invest-By-Mail
forms, since they are fund- and account-specific.

Make your check payable to: The Vanguard Group-02
All  purchases  must be made in U.S.  dollars,  and checks must be drawn on U.S.
banks.

First-class mail to:                    Express or Registered mail to:
The Vanguard Group                      The Vanguard Group
P.O. Box 1110                           455 Devon Park Drive
Valley Forge, PA 19482-1110             Wayne, PA 19087-1815

For clients of Vanguard's Institutional Division . . .

First-class mail to:                    Express or Registered mail to:
The Vanguard Group                      The Vanguard Group
P.O. Box 2900                           455 Devon Park Drive
Valley Forge, PA 19482-2900             Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
IMPORTANT  NOTE:  To prevent  check fraud,  Vanguard will not accept checks made
payable to third parties.
- --------------------------------------------------------------------------------
BY TELEPHONE TO . . . [TELEPHONE]
open a new account
Call Vanguard  Tele-Account*  24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same registration
(name, address,  taxpayer  identification  number, and account type). (Note that
some restrictions apply to index fund accounts.)
<PAGE>

22

add to an existing account
Call Vanguard  Tele-Account*  24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same registration
(name, address,  taxpayer  identification  number, and account type). (Note that
some restrictions  apply to index fund accounts.) Use Vanguard Fund Express (see
"Services and Account Features") to transfer assets from your bank account. Call
Client Services before your first use to verify that this option is available.

Vanguard Tele-Account                   Client Services
1-800-662-6273                          1-800-662-2739

*You must obtain a Personal  Identification Number (PIN) through Tele-Account at
least seven days before you request your first exchange.
- --------------------------------------------------------------------------------
IMPORTANT  NOTE:  Once  you  have  initiated  a  telephone   transaction  and  a
confirmation  number has been assigned,  the transaction  cannot be revoked.  We
reserve the right to refuse any purchase request.
- --------------------------------------------------------------------------------
BY WIRE TO OPEN A NEW ACCOUNT OR ADD TO AN EXISTING ACCOUNT [WIRE]
Call Client  Services to arrange your wire  transaction.  Wire  transactions  to
retirement  accounts are only  available for asset  transfers and rollovers from
other financial institutions.  Individual IRA contributions will not be accepted
by wire.

Wire to:
FRB ABA 021001088
HSBC Bank USA

For credit to:
Account: 000112046
Vanguard Incoming Wire Account

In favor of:
Vanguard Balanced Index Fund-02
[Account number, or temporary number for a new account]
[Registered account owner(s)]
[Registered address]
- --------------------------------------------------------------------------------
You can redeem (that is, sell or exchange) shares purchased by check or Vanguard
Fund  Express  at any time.  However,  while  your  redemption  request  will be
processed  at the  next-determined  net asset value after it is  received,  your
redemption  proceeds  will not be available  until  payment for your purchase is
collected, which may take up to ten calendar days.
- --------------------------------------------------------------------------------
A NOTE ON LARGE  PURCHASES
It is important that you call Vanguard  before you invest a large dollar amount.
It is our responsibility to consider the interests of all Fund shareholders, and
so we  reserve  the right to refuse any  purchase  that may  disrupt  the Fund's
operation or performance.
- --------------------------------------------------------------------------------
<PAGE>

                                                                              23

REDEEMING SHARES

This section describes how you can redeem--that is, sell or exchange--the Fund's
shares.

When Selling Shares:
- -    Vanguard sends the redemption proceeds to you or a designated third party.*
- -    You can sell all or part of your Fund shares at any time.


*May require a signature guarantee; see footnote on page 27.


When Exchanging Shares:
- -    The redemption proceeds are used to purchase shares of a different Vanguard
     fund.
- -    You must meet the receiving fund's minimum investment requirements.
- -    Vanguard reserves the right to revise or terminate the exchange  privilege,
     limit the amount of an exchange, or reject an exchange at any time, without
     notice.
- -    In  order  to  exchange  into  an  account  with a  different  registration
     (including a different name, address, or taxpayer  identification  number),
     you must include the guaranteed signatures of all current account owners on
     your written instructions.

In both  cases,  your  transaction  will be based on the Fund's  next-determined
share price, subject to any special rules discussed in this prospectus.
- --------------------------------------------------------------------------------
NOTE:  Once a redemption  is initiated  and a  confirmation  number  given,  the
transaction CANNOT be canceled.
- --------------------------------------------------------------------------------

HOW TO REQUEST A REDEMPTION
You can request a  redemption  from your Fund  account in any one of three ways:
online, by telephone, or by mail.

     The Vanguard funds whose shares you cannot  exchange online or by telephone
are:  VANGUARD U.S. STOCK INDEX FUNDS,  VANGUARD  BALANCED INDEX FUND,  VANGUARD
INTERNATIONAL  STOCK INDEX FUNDS,  VANGUARD REIT INDEX FUND, and VANGUARD GROWTH
AND INCOME FUND. These funds do, however,  permit online and telephone exchanges
within  IRAs and other  retirement  accounts.  If you sell shares of these funds
online, a redemption check will be sent to your address of record.

- --------------------------------------------------------------------------------
ONLINE REQUESTS [COMPUTER]
ACCESS VANGUARD at www.vanguard.com
You can use your personal  computer to sell or exchange  shares of most Vanguard
funds by accessing our website.  To establish  this  service,  you must register
through our website.  We will then mail you an account access password that will
enable  you to sell  or  exchange  shares  online  (as  well  as  perform  other
transactions).
- --------------------------------------------------------------------------------
TELEPHONE REQUESTS [TELEPHONE]
All Account Types Except Retirement:
Call Vanguard  Tele-Account  24 hours a day--or Client  Services during business
hours-- to sell or exchange  shares.  You can exchange  shares from this Fund to
open an account in another Vanguard fund or to add to an existing  Vanguard fund
account with an identical registration.
<PAGE>

24

Retirement Accounts:
You can  exchange--but  not  sell--shares  by  calling  Tele-Account  or  Client
Services.

Vanguard Tele-Account                   Client Services
1-800-662-6273                          1-800-662-2739
- --------------------------------------------------------------------------------
SPECIAL  INFORMATION:  We will automatically  establish the telephone redemption
option for your  account,  unless you instruct us  otherwise  in writing.  While
telephone  redemption is easy and convenient,  this account  feature  involves a
risk of loss from  unauthorized or fraudulent  transactions.  Vanguard will take
reasonable  precautions  to protect your  account from fraud.  You should do the
same by keeping your account information  private and immediately  reviewing any
account  statements  that  we  send  to  you.  Make  sure  to  contact  Vanguard
immediately about any transaction you believe to be unauthorized.
- --------------------------------------------------------------------------------
We reserve the right to refuse a telephone redemption if the caller is unable to
provide:
- -    The ten-digit account number.
- -    The name and address exactly as registered on the account.
- -    The primary Social Security or employer identification number as registered
     on the account.
- -    The Personal  Identification  Number (PIN),  if applicable  (for  instance,
     Tele-Account).
     Please note that Vanguard will not be  responsible  for any account  losses
due to telephone  fraud, so long as we have taken reasonable steps to verify the
caller's identity.  If you wish to remove the telephone  redemption feature from
your account, please notify us in writing.
- --------------------------------------------------------------------------------
A NOTE ON UNUSUAL CIRCUMSTANCES
Vanguard  reserves the right to revise or  terminate  the  telephone  redemption
privilege at any time,  without notice.  In addition,  Vanguard can stop selling
shares or postpone  payment at times when the New York Stock  Exchange is closed
or under any emergency  circumstances  as determined by the U.S.  Securities and
Exchange Commission.  If you experience difficulty making a telephone redemption
during  periods  of  drastic  economic  or market  change,  you can send us your
request  by  regular or express  mail.  Follow  the  instructions  on selling or
exchanging shares by mail in this section.
- --------------------------------------------------------------------------------
MAIL REQUESTS [ENVELOPE]
All Account Types Except Retirement:
Send a letter of instruction signed by all registered  account holders.  Include
the fund name and  account  number and (if you are  selling) a dollar  amount or
number  of shares  OR (if you are  exchanging)  the name of the fund you want to
exchange  into and a dollar  amount or number of  shares.  To  exchange  into an
account  with a different  registration  (including a different  name,  address,
taxpayer identification number, or account type), you must provide Vanguard with
written  instructions  that  include the  guaranteed  signatures  of all current
owners of the fund from which you wish to redeem.

Vanguard Retirement Accounts:
For information on how to request distributions from:
- -    Traditional IRAs and Roth IRAs--call Client Services.
- -    SEP-IRAs, SIMPLE IRAs, 403(b)(7) custodial accounts, and Profit-Sharing and
     Money Purchase Pension (Keogh) Plans--call  Individual  Retirement Plans at
     1-800-662-2003.

Depending on your account  registration  type,  additional  documentation may be
required.
<PAGE>

                                                                              25

First-class mail to:                    Express or Registered mail to:
The Vanguard Group                      The Vanguard Group
P.O. Box 1110                           455 Devon Park Drive
Valley Forge, PA 19482-1110             Wayne, PA 19087-1815

For clients of Vanguard's Institutional Division . . .

First-class mail to:                    Express or Registered mail to:
The Vanguard Group                      The Vanguard Group
P.O. Box 2900                           455 Devon Park Drive
Valley Forge, PA 19482-2900             Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
A NOTE ON LARGE REDEMPTIONS
It is important that you call Vanguard  before you redeem a large dollar amount.
It is our  responsibility to consider the interests of all fund shareholders and
so we reserve the right to delay  delivery of your  redemption  proceeds--up  to
seven days--if the amount may disrupt the Fund's  operation or  performance.
     If you redeem more than  $250,000  worth of Fund  shares  within any 90-day
period,  the  Fund  reserves  the  right  to pay  part or all of the  redemption
proceeds above $250,000  in-kind,  i.e., in securities,  rather than in cash. If
payment is made in-kind,  you may incur  brokerage  commissions  if you elect to
sell the securities for cash.
- --------------------------------------------------------------------------------

OPTIONS FOR REDEMPTION PROCEEDS
You may receive your redemption  proceeds in one of three ways: check,  exchange
to another Vanguard fund, or Fund Express Redemption.
- --------------------------------------------------------------------------------
CHECK REDEMPTIONS
Normally,  Vanguard  will  mail  your  check  within  two  business  days  of  a
redemption.
- --------------------------------------------------------------------------------
EXCHANGE REDEMPTIONS
As described  above, an exchange  involves using the proceeds of your redemption
to purchase shares of another Vanguard fund.
- --------------------------------------------------------------------------------
FUND EXPRESS REDEMPTIONS
Vanguard  will  electronically  transfer  funds to your  pre-linked  checking or
savings account.
- --------------------------------------------------------------------------------

FOR OUR MUTUAL PROTECTION
For your best interests and ours, Vanguard applies these additional requirements
to redemptions:

REQUEST IN "GOOD ORDER"
All redemption requests must be received by Vanguard in "good order." This means
that your request must include:
- -    The Fund name and account number.
- -    The amount of the transaction (in dollars or shares).
- -    Signatures  of all owners  exactly as  registered  on the account (for mail
     requests).
- -    Signature  guarantees (if required).*
- -    Any supporting legal documentation that may be required.
- -    Any outstanding certificates representing shares to be redeemed.
<PAGE>

26

*For instance,  a signature guarantee must be provided by all registered account
shareholders  when redemption  proceeds are to be sent to a different  person or
address. A signature  guarantee can be obtained from most commercial and savings
banks,  credit  unions,  trust  companies,  or  members  firms  of a U.S.  stock
exchange.

TRANSACTIONS ARE PROCESSED AT THE NEXT-DETERMINED SHARE PRICE AFTER VANGUARD HAS
RECEIVED ALL REQUIRED INFORMATION.
- --------------------------------------------------------------------------------
LIMITS ON ACCOUNT ACTIVITY
Because  excessive account  transactions can disrupt  management of the Fund and
increase the Fund's costs for all shareholders, Vanguard limits account activity
as follows:
- -    You may make no more than TWO  SUBSTANTIVE  "ROUND TRIPS"  THROUGH THE FUND
     during any 12-month period.
- -    Your round trips through the Fund must be at least 30 days apart.
- -    The Fund may refuse a share purchase at any time, for any reason.
- -    Vanguard may revoke an investor's telephone exchange privilege at any time,
     for any reason.

     A "round trip" is a redemption  from the Fund  followed by a purchase  back
into the Fund.  Also,  a "round trip" covers  transactions  accomplished  by any
combination  of methods,  including  transactions  conducted by check,  wire, or
exchange to/from another Vanguard fund. "Substantive" means a dollar amount that
Vanguard  determines,  in  its  sole  discretion,  could  adversely  affect  the
management of the Fund.
- --------------------------------------------------------------------------------
RETURN YOUR SHARE CERTIFICATES
Any portion of your account represented by share certificates cannot be redeemed
until you return the  certificates  to Vanguard.  Certificates  must be returned
(unsigned),  along with a letter  requesting  the sale or  exchange  you wish to
process, via certified mail to:

The Vanguard Group
455 Devon Park Drive
Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
ALL TRADES ARE FINAL
Vanguard  will not cancel any  transaction  request  (including  any purchase or
redemption)  that we believe to be authentic once the request has been initiated
and a confirmation number assigned.
- --------------------------------------------------------------------------------
UNCASHED CHECKS
Please cash your distribution or redemption  checks promptly.  Vanguard will not
pay interest on uncashed checks.
- --------------------------------------------------------------------------------
<PAGE>

                                                                              27

TRANSFERRING REGISTRATION

You can  transfer  the  registration  of your Fund  shares to  another  owner by
completing a transfer form and sending it to Vanguard.

First-class mail to:                    Express or Registered mail to:
The Vanguard Group                      The Vanguard Group
P.O. Box 1110                           455 Devon Park Drive
Valley Forge, PA 19482-1110             Wayne, PA 19087-1815

For clients of Vanguard's Institutional Division . . .

First-class mail to:                    Express or Registered mail to:
The Vanguard Group                      The Vanguard Group
P.O. Box 2900                           455 Devon Park Drive
Valley Forge, PA 19482-2900             Wayne, PA 19087-1815
- --------------------------------------------------------------------------------


FUND AND ACCOUNT UPDATES

STATEMENTS AND REPORTS
We will send you account and tax  statements to help you keep track of your Fund
account  throughout  the year as well as when you are preparing  your income tax
returns.

     In addition,  you will  receive  financial  reports  about the Fund twice a
year.  These   comprehensive   reports  include  an  assessment  of  the  Fund's
performance  (and a comparison  to its industry  benchmark),  an overview of the
financial  markets,  a  report  from  the  adviser,  and  the  Fund's  financial
statements which include a listing of the Fund's holdings.

     To keep  the  Fund's  costs  as low as  possible  (so  that  you and  other
shareholders can keep more of the Fund's investment earnings), Vanguard attempts
to  eliminate  duplicate  mailings  to the same  address.  When two or more Fund
shareholders  have the same last name and address,  we send just one Fund report
to that address--instead of mailing separate reports to each shareholder. If you
want us to send  separate  reports,  notify our Client  Services  Department  at
1-800-662-2739.
- --------------------------------------------------------------------------------
CONFIRMATION STATEMENT
Sent each time you buy,  sell, or exchange  shares;  confirms the trade date and
the amount of your transaction.
- --------------------------------------------------------------------------------
PORTFOLIO SUMMARY [BOOKLET]
Mailed  quarterly for most  accounts;  shows the market value of your account at
the close of the statement period, as well as distributions,  purchases,  sales,
and exchanges for the current calendar year.
- --------------------------------------------------------------------------------
FUND FINANCIAL REPORTS
Mailed in February and August for this Fund.
- --------------------------------------------------------------------------------
TAX STATEMENTS
Generally  mailed in January;  report previous year's dividend and capital gains
distributions,  proceeds from the sale of shares, and distributions from IRAs or
other retirement accounts.
- --------------------------------------------------------------------------------
<PAGE>

28

- --------------------------------------------------------------------------------
AVERAGE COST REVIEW STATEMENT [BOOKLET]
Issued quarterly for most taxable accounts (accompanies your Portfolio Summary);
shows the average  cost of shares that you redeemed  during the  calendar  year,
using only the average cost single category method.
- --------------------------------------------------------------------------------
<PAGE>

GLOSSARY OF INVESTMENT TERMS

ACTIVE MANAGEMENT
An investment approach that seeks to exceed the average returns of the financial
markets.  Active  managers  rely on research,  market  forecasts,  and their own
judgment and experience in selecting securities to buy and sell.

BALANCED FUND
A mutual fund that seeks to provide some combination of income,  capital growth,
and conservation of capital by investing in stocks,  bonds,  and/or money market
instruments.

BOND
A debt security (IOU) issued by a corporation,  government, or government agency
in exchange for the money you lend it. In most  instances,  the issuer agrees to
pay back the loan by a specific date and to make regular interest payments until
that date.

CAPITAL GAINS DISTRIBUTION
Payment to mutual fund  shareholders of gains realized on securities that a fund
has sold at a profit, minus any realized losses.

CREDIT QUALITY
A measure of a bond  issuer's  ability to pay interest and principal in a timely
manner.

DIVIDEND INCOME
Payment to  shareholders  of income from  interest or  dividends  generated by a
fund's investments.

DURATION
A measure of the  sensitivity  of bond--and bond  fund--prices  to interest rate
movements.  For example,  if a bond has a duration of two years, its price would
fall by about 2% when interest  rates rose one  percentage  point.  On the other
hand,  the bond's price would rise by about 2% when  interest  rates fell by one
percentage point.

EXPENSE RATIO
The  percentage  of a fund's  average net assets used to pay its  expenses.  The
expense ratio  includes  management  fees,  administrative  fees,  and any 12b-1
distribution fees.

FACE VALUE
The  amount to be paid at  maturity  of a bond;  also  known as the par value or
principal.

INDEX
An unmanaged group of securities whose overall performance is used as a standard
to measure investment performance.

INVESTMENT GRADE
A bond whose credit quality is considered by independent bond-rating agencies to
be sufficient to ensure timely  payment of principal and interest  under current
economic  circumstances.  Bonds rated in one of the four highest  categories are
considered "investment grade."

MATURITY
The date when a bond issuer agrees to repay the bond's principal, or face value,
to the bond's buyer.

NET ASSET VALUE (NAV)
The market value of a mutual fund's total assets, minus liabilities,  divided by
the  number of shares  outstanding.  The value of a single  share is called  its
share value or share price.

PASSIVE MANAGEMENT
A low-cost  investment strategy in which a mutual fund attempts to match--rather
than  outperform--  a  particular  stock or bond  market  index.  Also  known as
indexing.

PRICE/EARNINGS (P/E) RATIO
The current share price of a stock,  divided by its per-share earnings (profits)
from the past year. A stock selling for $20, with earnings of $2 per share,  has
a price/earnings ratio of 10.

TOTAL RETURN
A percentage change,  over a specified time period, in a mutual fund's net asset
value,  with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.

VOLATILITY
The  fluctuations  in value of a mutual  fund or other  security.  The greater a
fund's volatility, the wider the fluctuations between its high and low prices.

YIELD
Income  (interest  or  dividends)  earned  by  an  investment,  expressed  as  a
percentage of the investment's price.
<PAGE>

                                                     [SHIP]
                                                     [THE VANGUARD GROUP(R)]
                                                     Post Office Box 2600
                                                     Valley Forge, PA 19482-2600


FOR MORE INFORMATION
If you'd like more information about
Vanguard Balanced Index Fund, the
following documents are available
free upon request:

ANNUAL/SEMIANNUAL REPORTS
TO SHAREHOLDERS
Additional information about the
Fund's investments is available in
the Fund's annual and semiannual
reports to shareholders.

STATEMENT OF ADDITIONAL
INFORMATION (SAI)
The SAI provides more detailed
information about the Fund.

The current annual and semiannual
reports and the SAI are
incorporated by reference into
(and are thus legally a part of)
this prospectus.

To receive a free copy of the latest
annual or semiannual report or the
SAI, or to request additional
information about the Fund or other
Vanguard funds, please contact us
as follows:

THE VANGUARD GROUP
INVESTOR INFORMATION
DEPARTMENT
P.O. BOX 2600
VALLEY FORGE, PA 19482-2600

TELEPHONE:
1-800-662-7447 (SHIP)

TEXT TELEPHONE:
1-800-952-3335

WORLD WIDE WEB:
WWW.VANGUARD.COM

If you are a current Fund shareholder
and would like information about
your account, account transactions,
and/or account statements,
please call:

CLIENT SERVICES DEPARTMENT
TELEPHONE:
1-800-662-2739 (CREW)

TEXT TELEPHONE:
1-800-749-7273

INFORMATION PROVIDED BY THE
SECURITIES AND EXCHANGE
COMMISSION (SEC)

You can review and copy information
about the Fund (including the SAI) at
the SEC's Public Reference Room in
Washington, DC. To find out more
about this public service, call the
SEC at 1-202-942-8090. Reports and
other information about the Fund are
also available on the SEC's website
(www.sec.gov), or you can receive
copies of this information, for a fee,
by electronic request at the
following e-mail address:
[email protected], or by writing the
Public Reference Section, Securities
and Exchange Commission,
Washington, DC 20549-0102.


Fund's Investment Company Act
file number: 811-7023

(C) 2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation,
Distributor.

P002N-04/07/2000

<PAGE>

                                                       VANGUARD(R)
                                                       BALANCED INDEX
                                                       FUND

                                                       Participant Prospectus
                                                       April 7, 2000

This prospectus contains
financial data for the
Fund through the
fiscal year ended
December 31, 1999.

                                                       [A MEMBER OF
                                                       THE VANGUARD GROUP(R)]
<PAGE>

VANGUARD BALANCED INDEX FUND
Participant Prospectus
April 7, 2000

A Balanced Mutual Fund

- --------------------------------------------------------------------------------
CONTENTS
- --------------------------------------------------------------------------------
 1 FUND PROFILE                           14 DIVIDENDS, CAPITAL GAINS, AND TAXES

 3 ADDITIONAL INFORMATION                 15 SHARE PRICE

 4 AN INTRODUCTION TO INDEX FUNDS         16 FINANCIAL HIGHLIGHTS

 4 A WORD ABOUT RISK                      18 INVESTING WITH VANGUARD

 5 WHO SHOULD INVEST                      19 ACCESSING FUND INFORMATION BY
                                             COMPUTER
 5 PRIMARY INVESTMENT STRATEGIES
                                          GLOSSARY (inside back cover)
13 THE FUND AND VANGUARD

13 INVESTMENT ADVISER
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
WHY READING THIS PROSPECTUS IS IMPORTANT
This  prospectus  explains the  objective,  risks,  and  strategies  of Vanguard
Balanced  Index Fund. To highlight  terms and concepts  important to mutual fund
investors,  we have provided "Plain Talk(R)" explanations along the way. Reading
the prospectus will help you to decide whether the Fund is the right  investment
for you. We suggest that you keep it for future reference.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
IMPORTANT NOTE
This prospectus is intended for participants in employer-sponsored retirement or
savings plans. Another version--for  investors who would like to open a personal
investment account--can be obtained by calling Vanguard at 1-800-662-7447.
- --------------------------------------------------------------------------------


NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
<PAGE>

                                                                               1

FUND PROFILE

The following profile summarizes key features of Vanguard Balanced Index Fund.

INVESTMENT OBJECTIVE
The Fund seeks to provide  current  income  and  long-term  growth of income and
capital.

INVESTMENT STRATEGIES
The Fund typically  invests 60% of its assets in common stocks and 40% in bonds.
The stock  portion of the Fund seeks to match the total  return of the  Wilshire
5000 Total Market Index, a widely recognized  measure for the U.S. stock market.
The Fund's bond portion  seeks to replicate  the returns of the Lehman  Brothers
Aggregate  Bond Index,  a measure of  regularly  traded,  U.S.  investment-grade
bonds. There is no assurance that the Fund will achieve its stated objective.

PRIMARY RISKS
THE FUND'S TOTAL RETURN,  LIKE STOCK AND BOND PRICES  GENERALLY,  WILL FLUCTUATE
WITHIN A WIDE  RANGE,  SO AN  INVESTOR  COULD LOSE MONEY OVER SHORT OR EVEN LONG
PERIODS.  The Fund is also subject to:
- -    Stock  market  risk,  which is the chance that stock prices in general will
     decline  over  short or even long  periods.  The stock  market  tends to be
     cyclical,  with periods when stock prices  generally  rise and periods when
     stock prices generally decline.
- -    Interest  rate risk,  which is the chance  that bond  prices  overall  will
     decline  over  short or even long  periods  due to rising  interest  rates.
     Interest rate risk should be moderate for the Fund.
- -    Income risk, which is the chance that falling interest rates will cause the
     Fund's income to decline. Income risk should be moderate for the Fund.
- -    Credit  risk,  which is the  chance  that a bond  issuer  will  fail to pay
     interest and  principal  in a timely  manner,  reducing the Fund's  return.
     Credit risk should be low for the Fund.

- -    Prepayment  risk,  which is the  chance  that  during  periods  of  falling
     interest rates, a mortgage-backed  bond issuer will repay a higher-yielding
     bond before its maturity date because the  underlying  mortgages  have been
     paid off ahead of  schedule.  If a bond is called,  the Fund would lose the
     opportunity  for  additional  price  appreciation,  and  would be forced to
     reinvest the  unanticipated  proceeds at lower interest rates. As a result,
     the Fund would experience a decline in income.

- -    Index sampling risk,  which is the chance that the securities  selected for
     the Fund  will not  provide  investment  performance  matching  that of the
     index. Index sampling risk for the Fund should be low.

PERFORMANCE/RISK INFORMATION
The bar chart and table below  provide an indication of the risk of investing in
the Fund. The bar chart shows the Fund's performance in each calendar year since
inception.  The table shows how the Fund's  average annual total returns for one
and five calendar  years and since  inception  compare to those of a broad-based
securities  market index. Keep in mind that the Fund's past performance does not
necessarily indicate how it will perform in the future.
<PAGE>

2

- --------------------------------------------------------------------------------
                              ANNUAL TOTAL RETURNS
- --------------------------------------------------------------------------------
                                 1993    10.00%
                                 1994    -1.56%
                                 1995    28.64%
                                 1996    13.95%
                                 1997    22.24%
                                 1998    17.85%
                                 1999    13.61%
- --------------------------------------------------------------------------------

     During the period shown in the bar chart, the highest return for a calendar
quarter was 12.67% (quarter ended December 31, 1998) and the lowest return for a
quarter was -5.57% (quarter ended September 30, 1998).

- --------------------------------------------------------------------------------
          AVERAGE ANNUAL TOTAL RETURNS FOR YEARS ENDED DECEMBER 31, 1999
- --------------------------------------------------------------------------------
                                                                    SINCE
                                        1 YEAR      5 YEARS       INCEPTION*
- --------------------------------------------------------------------------------
Vanguard Balanced Index Fund            13.61%       19.13%         14.89%
Balanced Composite Index**              13.54        19.30          15.19
Wilshire 5000 Index                     23.77        27.11          20.92
Lehman Brothers Aggregate Bond Index    -0.82         7.73           6.57
- --------------------------------------------------------------------------------
 *November 9, 1992.
**Made up of two unmanaged benchmarks,  weighted 60% Wilshire 5000 Index and 40%
  Lehman Brothers Aggregate Bond Index.
- --------------------------------------------------------------------------------

FEES AND EXPENSES
The following  table  describes the fees and expenses you may pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1999.

      SHAREHOLDER FEES (fees paid directly from your investment)
      Sales Charge (Load) Imposed on Purchases:                          None
      Transaction Fee on Purchases:                                      None
      Sales Charge (Load) Imposed on Reinvested Dividends:               None
      Redemption Fee:                                                    None
      Exchange Fee:                                                      None

      ANNUAL FUND OPERATING EXPENSES (expenses deducted from the Fund's
      assets)
      Management Expenses:                                              0.17%
      12b-1 Distribution Fee:                                            None
      Other Expenses:                                                   0.03%
        TOTAL ANNUAL FUND OPERATING EXPENSES:                           0.20%

    The Fund  reserves the right to deduct a  transaction  fee of 0.08% from an
investor's cumulative purchases over $100 million.  Where it applies, the fee is
retained  by the  Fund to  offset  transaction  costs  of  investing  large  new
contributions  into the  market.  The fee is not paid to  Vanguard  and is not a
sales charge.
<PAGE>

                                                                               3

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  FUND EXPENSES
All mutual funds have operating  expenses.  These  expenses,  which are deducted
from a fund's gross  income,  are expressed as a percentage of the net assets of
the fund.  Vanguard  Balanced Index Fund's expense ratio in fiscal year 1999 was
0.20%, or $2 per $1,000 of average net assets.  The average balanced mutual fund
had  expenses  in 1999 of 1.33%,  or $13.30  per  $1,000 of  average  net assets
(derived  from data  provided by Lipper Inc.,  which  reports on the mutual fund
industry).  Management  expenses,  which  are one  part of  operating  expenses,
include investment advisory fees as well as other costs of managing a fund--such
as account maintenance,  reporting,  accounting, legal, and other administrative
expenses.
- --------------------------------------------------------------------------------

     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical  expenses  that you would incur over various  periods if you invest
$10,000 in the Fund.  This example assumes that the Fund provides a return of 5%
a year, and that operating  expenses  remain the same. The results apply whether
or not you redeem your investment at the end of each period.

- --------------------------------------------------------------------------------
             1 YEAR         3 YEARS         5 YEARS         10 YEARS
- --------------------------------------------------------------------------------
              $20             $64             $113            $255
- --------------------------------------------------------------------------------

     THIS  EXAMPLE  SHOULD NOT BE  CONSIDERED  TO REPRESENT  ACTUAL  EXPENSES OR
PERFORMANCE  FROM THE PAST OR FOR THE  FUTURE.  ACTUAL  FUTURE  EXPENSES  MAY BE
HIGHER OR LOWER THAN THOSE SHOWN.

- --------------------------------------------------------------------------------
ADDITIONAL INFORMATION

DIVIDENDS AND CAPITAL GAINS                    NEWSPAPER ABBREVIATION
Dividends are distributed quarterly            Balanced
in March, June, September, and
December; capital gains, if any, are           VANGUARD FUND NUMBER
distributed annually in December               02

INVESTMENT ADVISER                             CUSIP NUMBER
The Vanguard Group, Inc., Valley Forge, Pa.,   921931101
since inception
                                               TICKER SYMBOL
INCEPTION DATE                                 VBINX
November 9, 1992

NET ASSETS AS OF DECEMBER 31, 1999
$3.1 billion
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                             THE COSTS OF INVESTING
Costs are an important  consideration in choosing a mutual fund.  That's because
you, as a shareholder,  pay the costs of operating a fund,  plus any transaction
costs  associated with the fund's buying and selling of securities.  These costs
can erode a substantial  portion of the gross income or capital  appreciation  a
fund achieves. Even seemingly small differences in expenses can, over time, have
a dramatic effect on a fund's performance.
- --------------------------------------------------------------------------------
<PAGE>

4

AN INTRODUCTION TO INDEX FUNDS

WHAT IS INDEXING?
An index is an unmanaged group of securities  whose overall  performance is used
as a standard to measure the investment  performance of a particular  market. An
index (or "passively managed") fund tries to match, as closely as possible,  the
performance of an established  target index.  The fund does this by holding all,
or a representative sample, of the securities that comprise the index.
     The target  index may be a group of stocks or bonds,  or a  combination  of
stocks and bonds. Balanced index funds hold a mix of stocks and bonds.
     Index funds do not have active managers who buy and sell  securities  based
on research  and  analysis.  Rather,  index funds are  passively  managed by the
adviser who seeks to match a market benchmark.

WHY INVEST IN INDEX FUNDS?
Index funds appeal to many investors for a number of reasons:
- -    Variety of  investments.  Vanguard index funds  generally  invest in a wide
     variety of companies and industries.
- -    Relative consistency.  Because they seek to track market benchmarks,  index
     funds by definition  should not perform  dramatically  better or worse than
     their benchmarks.
- -    Low cost.  Index funds are  inexpensive  to run as compared  with  actively
     managed funds.  They have lower  research costs and keep trading  activity,
     and thus trading costs, to a minimum.
- -    Low  realization  of capital gains.  Because an index fund typically  sells
     securities only to respond to redemption requests or to adjust its holdings
     to reflect a change in its target index, the fund's turnover rate--and thus
     its realization of taxable capital gains--is usually very low.

     KEEP IN MIND THAT AN INDEX  FUND HAS  OPERATING  EXPENSES  AND  TRANSACTION
COSTS;  A MARKET INDEX DOES NOT.  THEREFORE,  AN INDEX  FUND--WHILE  EXPECTED TO
TRACK ITS TARGET INDEX AS CLOSELY AS POSSIBLE--WILL TYPICALLY BE UNABLE TO MATCH
THE PERFORMANCE OF THE INDEX EXACTLY.

- --------------------------------------------------------------------------------
A WORD ABOUT RISK

This  prospectus  describes  risks you would  face as an  investor  in  Vanguard
Balanced  Index Fund.  It is important to keep in mind one of the main axioms of
investing: The higher the risk of losing money, the higher the potential reward.
The  reverse,  also,  is  generally  true:  The lower  the  risk,  the lower the
potential  reward.  As you consider an investment  in the Fund,  you should also
take into account your  personal  tolerance  for the daily  fluctuations  of the
stock and bond markets.
     Look for this [FLAG] symbol  throughout the prospectus.  It is used to mark
detailed  information  about  each  type of risk that you  would  confront  as a
shareholder of the Fund.
- --------------------------------------------------------------------------------
<PAGE>

                                                                               5

WHO SHOULD INVEST

The Fund may be a suitable investment for you if:
- -    You are seeking  moderate  current income and long-term growth of principal
     and income.
- -    You are seeking a diversified combination of U.S. stocks and bonds.
- -    You are willing to invest for the long term--at least five years.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                             COSTS AND MARKET-TIMING
Some   investors  try  to  profit  from   market-timing--switching   money  into
investments  when they  expect  prices to rise,  and taking  money out when they
expect  the  market  to fall.  As money is  shifted  in and out,  a fund  incurs
expenses  for buying and selling  securities.  These costs are borne by all fund
shareholders,  including the long-term  investors who do not generate the costs.
Therefore,  the Fund  discourages  short-term  trading by,  among other  things,
limiting the number of exchanges it permits.
- --------------------------------------------------------------------------------

     THE VANGUARD FUNDS DO NOT PERMIT MARKET-TIMING.  DO NOT INVEST IN THIS FUND
IF YOU ARE A MARKET-TIMER.

The Fund has  adopted  the  following  policies,  among  others,  to  discourage
short-term  trading:
- -    The Fund  reserves  the right to  reject  any  purchase  request--including
     exchanges from other  Vanguard  funds--that it regards as disruptive to the
     efficient  management  of the Fund.  A purchase  request  could be rejected
     because  of the  timing  of the  investment  or  because  of a  history  of
     excessive trading by the investor.
- -    Telephone and online exchanges are not accepted for non-IRA accounts.
- -    There is a limit on the  number of times you can  exchange  into and out of
     the Fund (see "Exchanges" in the INVESTING WITH VANGUARD section).
- -    The Fund reserves the right to stop offering shares at any time.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                 BALANCED FUNDS
Balanced  funds are  generally  "middle  of the road"  investments  that seek to
provide some  combination  of growth,  income,  and  conservation  of capital by
investing in a mix of stocks,  bonds, and/or money market  instruments.  Because
the prices of stocks  and bonds  often move in  different  directions,  balanced
funds are able to use  rewards  from one type of  investment  to help offset the
risks from another.
- --------------------------------------------------------------------------------


PRIMARY INVESTMENT STRATEGIES

This section explains the strategies that the investment adviser uses in pursuit
of the Fund's  objective--current  income and  long-term  growth of capital  and
income.  It also  explains  how the  adviser  implements  these  strategies.  In
addition,  this section discusses several  important  risks--stock  market risk,
interest rate risk,  income risk,  credit risk,  and  prepayment  risk--faced by
investors  in the  Fund.  The  Fund's  Board of  Trustees,  which
<PAGE>

6

oversees the management of the Fund, may change the Fund's investment  objective
or strategies in the interest of shareholders, without a shareholder vote.

MARKET EXPOSURE

STOCKS
About 60% of the Fund's assets are invested in common  stocks,  in an attempt to
replicate  with that portion of the assets the  performance of the Wilshire 5000
Index.

[FLAG] THE FUND IS SUBJECT TO STOCK MARKET RISK,  WHICH IS THE CHANCE THAT STOCK
     PRICES OVERALL WILL DECLINE OVER SHORT OR EVEN LONG PERIODS.  STOCK MARKETS
     TEND TO MOVE IN  CYCLES,  WITH  PERIODS  OF RISING  PRICES  AND  PERIODS OF
     FALLING PRICES.

     To illustrate the volatility of stock prices, the following table shows the
best,  worst,  and average total returns for the U.S.  stock market over various
periods as measured by the Standard & Poor's 500 Index,  a widely used barometer
of market  activity.  (Total returns  consist of dividend  income plus change in
market  price.)  Note that the returns  shown do not include the costs of buying
and selling  stocks or other  expenses  that a real-world  investment  portfolio
would  incur.  Note,  also,  that the gap between best and worst tends to narrow
over the long term.  (The S&P 500 Index is shown here  because  this  benchmark,
unlike the Wilshire 5000 Index, has been in existence for all of the periods
shown.)

- --------------------------------------------------------------------------------
                     U.S. STOCK MARKET RETURNS (1926-1999)
- --------------------------------------------------------------------------------
                                1 YEAR     5 YEARS     10 YEARS     20 YEARS
- --------------------------------------------------------------------------------
Best                             54.2%      28.6%        19.9%        17.9%
Worst                           -43.1      -12.4         -0.9          3.1
Average                          13.2       11.0         11.1         11.1
- --------------------------------------------------------------------------------

     The table  covers all of the 1-, 5-,  10-,  and 20-year  periods  from 1926
through 1999. You can see, for example,  that while the average return on common
stocks for all of the 5-year periods was 11.0%,  returns for  individual  5-year
periods  ranged from a -12.4%  average  (from 1928 through  1932) to 28.6% (from
1995 through 1999).  These average  returns  reflect past  performance on common
stocks;  you should not regard  them as an  indication  of future  returns  from
either the stock  market as a whole or this Fund in  particular,  which  invests
approximately 40% of its assets in bonds.
     While the Fund's holdings will typically  include the 500 largest stocks in
the  Wilshire  5000 Index,  they will not include all of the  securities  in the
Index. Instead, the Fund will invest in a representative sample of stocks.
     Keep in mind,  too,  that while the  Wilshire  5000 Index is  dominated  by
large-cap  stocks  (those  contained  in the S&P 500 Index),  small- and mid-cap
issues are also represented. The Fund's stock holdings are adjusted on a regular
basis to reflect the Wilshire 5000 Index. As of December 31, 1999,  about 22.16%
of the market value of the Wilshire 5000 Index was comprised of securities  that
were not in the S&P 500 Index.  Stocks of smaller  companies  have  historically
been more volatile than--and at times have performed quite differently from--the
stocks of larger companies.
<PAGE>

                                                                               7

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                    LARGE-CAP, MID-CAP, AND SMALL-CAP STOCKS
Stocks  of  publicly  traded   companies--and   mutual  funds  that  hold  these
stocks--can be classified by the  companies'  market value,  or  capitalization.
Market  capitalization  changes over time, and there is no "official" definition
of the boundaries of large-,  mid-,  and small-cap  stocks.  Vanguard  generally
defines  large-capitalization  (large-cap)  funds as  those  holding  stocks  of
companies  whose  outstanding  shares have a market value exceeding $12 billion;
mid-cap funds as those holding  stocks of companies  with a market value between
$1 billion and $12  billion;  and  small-cap  funds as those  typically  holding
stocks  of  companies  with a market  value of less  than $1  billion.  Vanguard
periodically reassesses these classifications.
- --------------------------------------------------------------------------------

BONDS

About 40% of the Fund's assets are invested in bonds, in an attempt to replicate
with that portion of the assets the performance of the Lehman Brothers Aggregate
Bond Index.


[FLAG] THE FUND IS SUBJECT TO INTEREST RATE RISK,  WHICH IS THE CHANCE THAT BOND
     PRICES  OVERALL  WILL DECLINE OVER SHORT OR EVEN LONG PERIODS DUE TO RISING
     INTEREST RATES. INTEREST RATE RISK SHOULD BE MODERATE FOR SHORTER-TERM BOND
     FUNDS AND HIGH FOR  LONGER-TERM  BOND FUNDS.  BECAUSE THE FUND INVESTS IN A
     PORTFOLIO OF BONDS WITH AN  INTERMEDIATE  AVERAGE  MATURITY  (5-10  YEARS),
     INTEREST RATE RISK IS MODERATE.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                            BONDS AND INTEREST RATES
As a rule,  when  interest  rates rise,  bond prices fall.  The opposite is also
true:  Bond  prices go up when  interest  rates  fall.  Why do bond  prices  and
interest  rates move in opposite  directions?  Let's assume that you hold a bond
offering a 5% yield. A year later,  interest rates are on the rise and bonds are
offered with a 6% yield. With  higher-yielding  bonds available,  you would have
trouble selling your 5% bond for the price you  paid--causing  you to lower your
asking  price.  On the other hand,  if interest  rates were falling and 4% bonds
were  being  offered,  you should be able to sell your 5% bond for more than you
paid.
- --------------------------------------------------------------------------------

     Although  bonds are often thought to be less risky than stocks,  there have
been periods when bond prices have fallen  significantly  due to rising interest
rates.  For  instance,  prices of  long-term  bonds fell by almost  48%  between
December 1976 and September 1981.
     To illustrate the volatility of bond prices,  the following table shows the
effect of both a 1% and a 2%  change  (both up and  down) in  interest  rates on
three bonds of different maturities, each with a face value of $1,000.
<PAGE>

8

- --------------------------------------------------------------------------------
                      HOW INTEREST RATE CHANGES AFFECT THE
                             VALUE OF A $1,000 BOND*
- --------------------------------------------------------------------------------
                              AFTER A 1%   AFTER A 1%   AFTER A 2%    AFTER A 2%
TYPE OF BOND (MATURITY)        INCREASE     DECREASE     INCREASE      DECREASE
- --------------------------------------------------------------------------------
Short-Term (2.5 years)           $978        $1,023        $956         $1,046
Intermediate-Term (10 years)      932         1,074         870          1,156
Long-Term (20 years)              901         1,116         816          1,251
- --------------------------------------------------------------------------------
*Assumes a 7% yield.
- --------------------------------------------------------------------------------

     These  figures are for  illustration  only and should not be regarded as an
indication  of  future  returns  from the bond  market as a whole or the Fund in
particular.
     Changes in interest rates will affect bond income as well as bond prices.

[FLAG] THE FUND IS SUBJECT  TO INCOME  RISK,  WHICH IS THE CHANCE  THAT A FUND'S
     DIVIDENDS (INCOME) WILL DECLINE DUE TO FALLING INTEREST RATES.  INCOME RISK
     IS  GENERALLY  THE GREATEST FOR  SHORT-TERM  BOND FUNDS,  AND THE LEAST FOR
     LONG-TERM BOND FUNDS.

[FLAG] BECAUSE  IT  INVESTS  IN  MORTGAGE-BACKED  BONDS,  THE FUND IS SUBJECT TO
     PREPAYMENT  RISK,  WHICH IS THE  CHANCE  THAT  DURING  PERIODS  OF  FALLING
     INTEREST  RATES, A  MORTGAGE-BACKED  BOND ISSUER WILL  "CALL"--OR  REPAY--A
     HIGHER-YIELDING  BOND BEFORE ITS MATURITY  DATE.  IF A BOND IS CALLED,  THE
     FUND WOULD LOSE THE  OPPORTUNITY  FOR ADDITIONAL  PRICE  APPRECIATION,  AND
     WOULD BE FORCED TO REINVEST THE UNANTICIPATED  PROCEEDS AT A LOWER INTEREST
     RATE. AS A RESULT, THE FUND WOULD EXPERIENCE A DECLINE IN INCOME.

     Since the Fund  invests  only a portion  of its  assets in  mortgage-backed
bonds, the risk to the Fund is limited.

[FLAG] THE FUND IS  SUBJECT  TO CREDIT  RISK,  WHICH IS THE  CHANCE  THAT A BOND
     ISSUER WILL FAIL TO PAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.

     The credit quality of the Fund is expected to be very high, and thus credit
risk should be low. The weighted  average credit quality of the Fund's holdings,
as rated by Moody's Investors Service, as of December 31, 1999, was Aa1.
     To a limited extent,  the Fund is also exposed to event risk,  which is the
chance  that  corporate  fixed-income  securities  held by the Fund may suffer a
substantial  decline  in credit  quality  and  market  value due to a  corporate
restructuring or other corporate event.
     Finally,  because stock and bond prices often move in different directions,
the Fund's bond holdings help to dampen--but  not  eliminate--some  of the stock
market volatility  experienced by the Fund. Likewise,  changes in interest rates
may not have as  dramatic  an effect on the Fund as they would on a fund made up
entirely of bonds.
<PAGE>

                                                                               9

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                 BOND MATURITIES
A bond is issued with a specific  maturity  date--the date when the bond issuer,
or seller,  must pay back the bond's  initial value (known as its "face value").
Bond maturities generally range from less than one year (short-term) to 30 years
(long-term).  The  longer  a  bond's  maturity,  the more  risk  you,  as a bond
investor,  face as interest  rates  rise--but  also the more  interest you could
receive. Long-term bonds are more suitable for investors willing to take greater
risks in hopes of higher yields;  short-term bond investors should be willing to
accept  lower  yields  in  return  for less  fluctuation  in the  value of their
investment.
- --------------------------------------------------------------------------------

SECURITY SELECTION

INDEXING METHODS

In  seeking  to track a  particular  index,  a fund may use one of two  indexing
methods to select the stocks or bonds in which it invests.

     Some index funds hold each stock or bond found in their  target  indexes in
about  the same  proportions  as  represented  in the  indexes  themselves.  For
example,  if 5% of the S&P 500 Index  were  made up of the  stock of a  specific
company,  a fund tracking that index would invest about 5% of its assets in that
company.

     Other index funds may use a different  selection process.  Because it would
be impractical to buy and sell all of the securities  represented  (the Wilshire
5000 Index,  for  example,  included  more than 7,000  stocks as of December 31,
1999),  many funds  tracking  these larger  indexes use a "sampling"  technique.
Using a sophisticated  computer program, these funds select securities that will
recreate   their  target   indexes  in  terms  of  industry,   size,  and  other
characteristics. For instance, if 10% of the Wilshire 5000 Index were made up of
utility  stocks,  the Balanced  Index Fund would allocate about 10% of its stock
investment to the utility stocks of the index with similar characteristics.


[FLAG] THE FUND IS SUBJECT TO INDEX SAMPLING RISK,  WHICH IS THE CHANCE THAT THE
     SECURITIES SELECTED WILL NOT PROVIDE INVESTMENT  PERFORMANCE  MATCHING THAT
     OF THE TARGET INDEXES. INDEX SAMPLING RISK SHOULD BE LOW.

STOCKS
The Fund's common stock portfolio is designed to have investment characteristics
that  parallel  those  of the  Wilshire  5000  Index.  The Fund is  expected  to
replicate  approximately  1,000 of the largest  securities  in the Wilshire 5000
Index as measured by market capitalization,  plus a representative sample of the
remainder,  which are selected primarily on the basis of market  capitalization,
industry weightings, and other fundamental characteristics.  Typically, the Fund
holds a total of between 3,000 and 3,500 stocks.

BONDS
The Fund's bond portfolio is designed to have  investment  characteristics  that
parallel   those  of  the  Lehman   Brothers   Aggregate  Bond  Index,  a  broad
market-weighted  index that encompasses  five major classes of  investment-grade
fixed-income   securities  in  the  United  States:  U.S.  Treasury  and  agency
securities,   corporate   bonds,   mortgage-backed   securities,   international
dollar-denominated  bonds, and asset-backed  securities with maturities  greater
than one year. The Fund will invest in a  representative  sample of fixed-income
securities in
<PAGE>

10

the index,  which,  taken  together,  are  expected to perform  similarly to the
index. These securities are described further as follows:
- -    U.S.  government  securities  include U.S. Treasury and agency bonds, which
     represent  loans by an investor to the U.S.  Treasury  Department or a wide
     variety of governmental agencies and  instrumentalities.  Timely payment of
     principal  and interest on these bonds is  guaranteed by the full faith and
     credit of the U.S. government; some agency bonds have the same guarantee.
- -    Corporate bonds are IOUs issued by businesses that want to borrow money for
     some  purpose--often to develop a new product or service,  to expand into a
     new market,  or to buy another  company.  As with other types of bonds, the
     issuer  promises  to repay the  principal  on a  specific  date and to make
     interest  payments in the meantime.  The amount of interest offered depends
     both on market  conditions and on the financial  health of the  corporation
     issuing the bonds; a company whose credit rating is not strong will have to
     offer a relatively high interest rate to obtain buyers for its bonds.
- -    Mortgage-backed  securities  represent  interests  in  underlying  pools of
     mortgages.  Unlike  ordinary  bonds,  which  generally  pay a fixed rate of
     interest  at regular  intervals  and then repay  principal  upon  maturity,
     mortgage-backed  bonds pay both  interest  and  principal  as part of their
     regular payments. Because the mortgages underlying the bonds can be prepaid
     at any time by homeowners or corporate borrowers, mortgage-backed bonds are
     subject to prepayment risk, as discussed earlier in this prospectus.  These
     types of bonds are issued by a number of government agencies, including the
     Government  National  Mortgage  Association  (GNMA),  often  referred to as
     "Ginnie  Mae," the Federal  Home Loan  Mortgage  Corporation  (FHLMC),  the
     Federal National Mortgage  Association (FNMA), often referred to as "Fannie
     Mae," and the Federal Housing Authority (FHA). GNMA bonds are guaranteed by
     the full faith and credit of the U.S.  government as to the timely  payment
     of principal and interest;  bonds issued by other  government  agencies are
     not.  (Note:  The  Balanced  Index  Fund may also  invest  in  conventional
     mortgage-backed securities,  which are packaged by private corporations and
     are not guaranteed by the U.S. government.)
- -    International  dollar-denominated  bonds  are  bonds  denominated  in  U.S.
     dollars issued by foreign  governments  and  companies.  Because the bond's
     value is designated in dollars  rather than in the currency of the issuer's
     country,  the investor is not exposed to currency risk;  rather, the issuer
     assumes the risk, usually to attract U.S. investors.
- -    Asset-backed  securities  are bonds backed by an underlying  pool of assets
     such as automobile loans,  credit card loans, and home equity loans.  These
     securities are structured  with varying  amounts of credit risk,  depending
     primarily  on the  quality of the  underlying  assets.  They are  generally
     issued  by  private  corporations  and  are  not  guaranteed  by  the  U.S.
     government.  Asset-backed bonds are subject to prepayment risk as discussed
     earlier in this prospectus.
     In "sampling" its target index,  the Fund has the flexibility to overweight
particular types of bonds relative to their  representation  in the index.  This
normally involves substituting  corporate bonds for government bonds of the same
maturity.  The corporate  substitution strategy increases the Fund's income, but
also marginally increases exposure to credit risk, which is explained on page 8.
The Fund limits corporate  substitutions to bonds with less than approximately 4
years' remaining  maturity,  and the Fund will limit corporate  substitutions to
approximately 15% of its net assets.
     The Fund is generally managed without regard to tax ramifications.
<PAGE>

                                                                              11

FUND CHARACTERISTICS

STOCKS
The following table provides a snapshot of some financial characteristics of the
Fund's stock holdings as of December 31, 1999.

- --------------------------------------------------------------------------------
         PRICE/EARNINGS      EARNINGS       DIVIDEND       PRICE/BOOK
              RATIO         GROWTH RATE      YIELD           RATIO
- --------------------------------------------------------------------------------
              27.40           17.30%         1.10%            5.00
- --------------------------------------------------------------------------------

- -    Price/earnings  ratio  is the  current  price of a  stock,  divided  by its
     per-share  earnings  (profits) from the past year. A stock selling for $20,
     with earnings of $2 per share, has a price/earnings ratio of 10.
- -    Earnings growth rate is the average annual rate, expressed as a percentage,
     of growth in  earnings  over the past five  years for the  stocks  now in a
     fund.
- -    Dividend  yield is current  income  (interest  or  dividends)  earned by an
     investment, expressed as a percentage of the investment's price.
- -    Price/book ratio is the current price of a stock, divided by its net worth,
     or book  value,  per  share.  For a fund,  this  ratio  is used to mean the
     weighted average price/book ratio of the stocks held by the fund.

BONDS
The following table provides a snapshot of the financial  characteristics of the
Fund's bond holdings as of December 31, 1999.

- --------------------------------------------------------------------------------
           NUMBER OF          AVERAGE        AVERAGE         AVERAGE
            ISSUES            MATURITY       QUALITY         DURATION
- --------------------------------------------------------------------------------
              449             9 years          Aa1           5 years
- --------------------------------------------------------------------------------

- -    Number of issues is an  indicator  of  diversification.  The more  separate
     issues a fund holds, the less susceptible it is to a price decline stemming
     from the problems of a particular issue.
- -    30-day yield is a snapshot of a fund's  income.  The yield,  expressed as a
     percentage  of the fund's net asset value,  is based on its income,  net of
     its  operating  expenses,  over  the  past 30 days  and is  annualized,  or
     projected forward for the coming year.
- -    Average  maturity is the average  length of time until bonds held by a fund
     reach maturity (or are called) and are repaid.  In general,  the longer the
     average maturity,  the more a fund's share price will fluctuate in response
     to changes in market interest rates.
- -    Weighted average quality is an indicator of credit risk. This figure is the
     average  of  the  ratings  assigned  to a  fund's  securities  holdings  by
     credit-rating  agencies.  The agencies make their judgment after appraising
     an issuer's ability to meet its obligations.  Quality is graded on a scale,
     with Aaa or AAA  indicating the most  creditworthy  bond issuers and A-1 or
     MIG-1 indicating the most creditworthy  issuers of money market securities.
     The Fund's  weighted  average  quality is based on the market  value of the
     bonds held by the Fund.
- -    Average  duration is an estimate of how much a bond fund's share price will
     fluctuate in response to a change in interest  rates.  To see how the price
     could  shift,  multiply  the fund's  duration  by the  change in rates.  If
     interest rates rise by one percentage point, the share price of a fund with
     an  average  duration  of five  years  would  decline by about 5%. If rates
     decrease by a percentage  point, the fund's share price would rise by about
     5%.
<PAGE>

12

TURNOVER RATE
Although the Fund  generally  seeks to invest for the long term,  it retains the
right to sell  securities  regardless of how long the securities have been held.
The Fund's average  turnover rate for the past five years has been about 25%. (A
turnover  rate of 100% would occur,  for example,  if the Fund sold and replaced
securities valued at 100% of its total net assets within a one-year period.)

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  TURNOVER RATE
Before  investing in a mutual fund,  you should review its turnover  rate.  This
gives an  indication  of how  transaction  costs could affect the fund's  future
returns.  In general,  the greater the volume of buying and selling by the fund,
the greater the impact that brokerage  commissions and other  transaction  costs
will have on its return. Also, funds with high turnover rates may be more likely
to generate  capital gains that must be  distributed to  shareholders  as income
subject to taxes.  As of December 31, 1999,  the average  turnover  rate for all
domestic   hybrid  funds  (a  category   that  includes   balanced   funds)  was
approximately 95%, according to Morningstar, Inc.
- --------------------------------------------------------------------------------

OTHER INVESTMENT POLICIES AND RISKS
Besides  investing in U.S.  common  stocks and bonds,  the Fund may make certain
other  kinds of  investments  to achieve its  objective.  The Fund may invest in
fixed-income  securities not in the target index  (non-public,  investment grade
securities--generally  referred to as 144A securities--as well as smaller public
issues or medium term notes not  included in the index due to their  size).  The
vast majority of these securities will have characteristics and risks similar to
those in the target index.  The Fund may also purchase money market  instruments
and certain  derivatives  in order to manage cash flow into and out of the Fund,
reduce  transaction  costs,  or add value when these  instruments  are favorably
priced.
     The Fund may invest, to a limited extent, in foreign securities.

     The Fund may also invest,  to a limited  extent,  in stock and bond futures
and options  contracts,  which are traditional types of derivatives.  Losses (or
gains)  involving  futures  can  sometimes  be  substantial--in  part  because a
relatively small price movement in a futures contract may result in an immediate
and  substantial  loss (or gain) for a fund.  This Fund will not use futures for
speculative  purposes  or as  leveraged  investments  that  magnify the gains or
losses of an  investment.  The Fund's  obligation to purchase  securities  under
futures contracts will not exceed 20% of its total assets.

     The reasons for which the Fund will invest in futures and options are:
- -    To keep cash on hand to meet  shareholder  redemptions or other needs while
     simulating full investment in stocks and bonds.
- -    To reduce the Fund's  transaction costs or add value when these instruments
     are favorably priced.
<PAGE>

                                                                              13

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                   DERIVATIVES
A derivative is a financial contract whose value is based on (or "derived" from)
a  traditional  security  (such  as a stock  or a  bond),  an  asset  (such as a
commodity like gold), or a market index (such as the S&P 500 Index). Futures and
options are derivatives  that have been trading on regulated  exchanges for more
than two decades.  These  "traditional"  derivatives are standardized  contracts
that can easily be bought and sold,  and whose market values are  determined and
published  daily. It is these  characteristics  that  differentiate  futures and
options from the relatively new types of derivatives. If used for speculation or
as leveraged investments, derivatives can carry considerable risks.
- --------------------------------------------------------------------------------


THE FUND AND VANGUARD

The Fund is a member of The Vanguard  Group, a family of more than 35 investment
companies  with more than 100 funds holding assets worth more than $540 billion.
All of the  Vanguard  funds  share  in the  expenses  associated  with  business
operations, such as personnel, office space, equipment, and advertising.
     Vanguard  also  provides   marketing   services  to  the  funds.   Although
shareholders do not pay sales commissions or 12b-1  distribution fees, each fund
pays its allocated share of The Vanguard Group's marketing costs.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                      VANGUARD'S UNIQUE CORPORATE STRUCTURE
The Vanguard Group is truly a MUTUAL mutual fund company. It is owned jointly by
the funds it oversees and thus  indirectly by the  shareholders  in those funds.
Most other mutual funds are operated by for-profit management companies that may
be owned by one person,  by a group of individuals,  or by investors who own the
management  company's stock. By contrast,  Vanguard  provides its services on an
"at-cost"  basis,  and the funds' expense  ratios  reflect only these costs.  No
separate  management  company reaps profits or absorbs losses from operating the
funds.
- --------------------------------------------------------------------------------


INVESTMENT ADVISER

The Vanguard Group (Vanguard), P.O. Box 2600, Valley Forge, PA 19482, founded in
1975,  serves as the Fund's adviser through its Core Management and Fixed Income
Groups.  As of the fiscal  year ended  December  31,  1999,  Vanguard  served as
adviser  for about  $371.4  billion in assets.  Vanguard  manages the Fund on an
at-cost basis,  subject to the control of the Trustees and officers of the Fund.
For the fiscal year ended December 31, 1999, the  investment  advisory  expenses
represented an effective annual rate of approximately 0.01%.
     The adviser is authorized to choose  brokers-dealers to handle the purchase
and sale of the Fund's securities,  and to seek out the best available price and
most  favorable  execution for all  transactions.  Also, the Fund may direct the
adviser to use a  particular  broker for certain  transactions  in exchange  for
commission rebates or research services provided to the Fund.
<PAGE>

14

     In the interest of obtaining better execution of a transaction, the adviser
may at times  choose  brokers who charge  higher  commissions.  If more than one
broker can obtain the best available  price and most favorable  execution,  then
the adviser is  authorized  to choose a broker who, in addition to executing the
transaction, will provide research services to the adviser or the Fund.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                               THE FUND'S ADVISER
The individuals primarily responsible for overseeing the Fund's investments are:

GEORGE U.  SAUTER,  Managing  Director of Vanguard and head of  Vanguard's  Core
Management  Group;  has worked in  investment  management  since  1985;  primary
responsibility  for  Vanguard's  stock indexing  investment  policy and strategy
since joining the company in 1987;  has served as the portfolio  manager for the
stock portion of the Fund since  inception;  A.B.,  Dartmouth  College;  M.B.A.,
University of Chicago.

IAN A.  MACKINNON,  Managing  Director of Vanguard and head of Vanguard's  Fixed
Income  Group;  has  worked  in  investment   management  since  1974;   primary
responsibility for Vanguard's  internal  fixed-income  policy and strategy since
joining the company in 1981; has been  responsible  for overseeing the portfolio
management  of the bond  portion of the Fund since  inception;  B.A.,  Lafayette
College; M.B.A., Pennsylvania State University.


FELIX B. LIM, has worked in investment management since completing his education
in 1996;  joined  Vanguard in January  1999;  worked as a credit  analyst  until
January 2000; B.A. and M.S., University of Pennsylvania (Wharton School).

- --------------------------------------------------------------------------------


DIVIDENDS, CAPITAL GAINS, AND TAXES

The Fund  distributes to shareholders  virtually all of its net income (interest
and dividends,  less  expenses),  as well as any capital gains realized from the
sale of its holdings. Income dividends generally are distributed in March, June,
September,  and  December;   capital  gains  distributions  generally  occur  in
December.   In  addition,   the  Fund  may  occasionally  be  required  to  make
supplemental  dividend or capital gains  distributions at some other time during
the year.
     Your  dividend  and  capital  gains  distributions  will be  reinvested  in
additional  Fund  shares  and  accumulate  on a  tax-deferred  basis  if you are
investing through an employer-sponsored retirement or savings plan. You will not
owe taxes on these  distributions until you begin withdrawals from the plan. You
should consult your plan administrator, your plan's Summary Plan Description, or
your tax adviser about the tax consequences of plan withdrawals.
<PAGE>

                                                                              15

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  DISTRIBUTIONS
As a  shareholder,  you are  entitled  to your share of the fund's  income  from
interest and dividends, and gains from the sale of investments. You receive such
earnings as either an income  dividend or a capital gains  distribution.  Income
dividends come from both the dividends that the fund earns from its holdings and
the  interest it receives  from its money market and bond  investments.  Capital
gains are realized  whenever the fund sells securities for higher prices than it
paid for them. These capital gains are either short-term or long-term, depending
on whether the fund held the  securities  for one year or less, or more than one
year.
- --------------------------------------------------------------------------------


SHARE PRICE

The Fund's share price,  called its net asset value,  or NAV, is calculated each
business day after the close of regular  trading on the New York Stock  Exchange
(the NAV is not  calculated  on  holidays  or other  days when the  Exchange  is
closed).  Net asset  value per share is computed by adding up the total value of
the Fund's  investments  and other assets,  subtracting  any of its  liabilities
(debts), and then dividing by the number of Fund shares outstanding:

                                  TOTAL ASSETS - LIABILITIES
           NET ASSET VALUE =   -------------------------------
                                 NUMBER OF SHARES OUTSTANDING

     Knowing the daily net asset value is useful to you as a shareholder because
it indicates the current value of your investment. The Fund's NAV, multiplied by
the  number of  shares  you own,  gives you the  dollar  amount  you would  have
received had you sold all of your shares back to the Fund that day.
     A NOTE ON PRICING:  The Fund's  investments  will be priced at their market
value when market  quotations are readily  available.  When these quotations are
not  readily  available,  investments  will  be  priced  at  their  fair  value,
calculated according to procedures adopted by the Fund's Board of Trustees.
     The Fund's  share price can be found  daily in the mutual fund  listings of
most major  newspapers  under the  heading  "Vanguard  Index  Funds."  Different
newspapers use different  abbreviations  of the Fund's name, but the most common
is BALANCED.
<PAGE>

16

FINANCIAL HIGHLIGHTS

The following financial  highlights table is intended to help you understand the
Fund's financial  performance for the past five years,  and certain  information
reflects  financial  results for a single Fund share.  The total  returns in the
table represent the rate that an investor would have earned or lost each year on
an investment  in the Fund  (assuming  reinvestment  of all dividend and capital
gains  distributions).  This  information  has been derived  from the  financial
statements audited by PricewaterhouseCoopers LLP, independent accountants, whose
report--along  with the Fund's financial  statements--is  included in the Fund's
most recent annual report to  shareholders.  You may have the annual report sent
to you without charge by contacting Vanguard.

- --------------------------------------------------------------------------------
                                            VANGUARD BALANCED INDEX FUND
                                               YEAR ENDED DECEMBER 31,
                                       -----------------------------------------
                                         1999     1998    1997     1996    1995
- --------------------------------------------------------------------------------
NET ASSET VALUE, BEGINNING OF YEAR     $18.48   $16.29  $13.92   $12.77  $10.34
- --------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income                    .58      .54    .520      .50     .45
 Net Realized and Unrealized Gain
   (Loss) on Investments                 1.88     2.33   2.525     1.26    2.48
                                       -----------------------------------------
   Total from Investment Operations      2.46     2.87   3.045     1.76    2.93
                                       -----------------------------------------
DISTRIBUTIONS
 Dividends from Net Investment Income    (.58)    (.54)  (.530)    (.49)   (.45)
 Distributions from Realized Capital
   Gains                                 (.14)    (.14)  (.145)    (.12)   (.05)
                                       -----------------------------------------
   Total Distributions                   (.72)    (.68)  (.675)    (.61)   (.50)
- --------------------------------------------------------------------------------
NET ASSET VALUE, END OF YEAR           $20.22   $18.48  $16.29   $13.92  $12.77
================================================================================
TOTAL RETURN                           13.61%   17.85%  22.24%   13.95%  28.64%
================================================================================
RATIOS/SUPPLEMENTAL DATA
 Net Assets, End of Year (Millions)    $3,128   $2,004  $1,260     $826    $590
 Ratio of Total Expenses to
   Average Net Assets                   0.20%    0.21%   0.20%    0.20%   0.20%
 Ratio of Net Investment Income to
   Average Net Assets                   3.18%    3.29%   3.56%    3.69%   3.85%
 Turnover Rate                            29%      25%     18%     37%*     16%
================================================================================
*Turnover rate excluding in-kind redemptions was 30%.
<PAGE>

                                                                              17

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                   HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE

The Fund began  fiscal 1999 with a net asset value  (price) of $18.48 per share.
During  the  year,  the Fund  earned  $0.58  per share  from  investment  income
(interest  and  dividends)  and  $1.88  per  share  from  investments  that  had
appreciated  in value or that were sold for higher prices than the Fund paid for
them.

Shareholders  received $0.72 per share in the form of dividend and capital gains
distributions.  A portion of each year's  distributions  may come from the prior
year's income or capital gains.

The  earnings  ($2.46  per  share)  minus the  distributions  ($0.72  per share)
resulted in a share price of $20.22 at the end of the year.  This was a increase
of $1.74 per share (from  $18.48 at the  beginning  of the year to $20.22 at the
end of the year).  For a shareholder  who  reinvested the  distributions  in the
purchase of more shares, the total return from the Fund was 13.61% for the year.

As of December 31, 1999, the Fund had $3.1 billion in net assets.  For the year,
its  expense  ratio  was  0.20%  ($2  per  $1,000  of net  assets);  and its net
investment  income  amounted to 3.18% of its  average  net  assets.  It sold and
replaced securities valued at 29% of its net assets.
- --------------------------------------------------------------------------------

"Standard & Poor's(R),"  "S&P(R),"  "S&P  500(R),"  "Standard & Poor's 500," and
"500" are trademarks of The McGraw-Hill Companies, Inc.
<PAGE>

18

INVESTING WITH VANGUARD

The Fund is an investment  option in your  retirement or savings plan. Your plan
administrator  or your  employee  benefits  office can provide you with detailed
information  on how to  participate in your plan and how to elect the Fund as an
investment option.

- -    If you have any questions about the Fund or Vanguard, including those about
     the Fund's investment objective,  strategies,  or risks, contact Vanguard's
     Participant Access Center, toll-free, at 1-800-523-1188.

- -    If you have questions about your account,  contact your plan  administrator
     or the organization that provides recordkeeping services for your plan.

INVESTMENT OPTIONS AND ALLOCATIONS
Your  plan's  specific  provisions  may  allow  you to  change  your  investment
selections,  the amount of your  contributions,  or how your  contributions  are
allocated  among the  investment  choices  available  to you.  Contact your plan
administrator or employee benefits office for more details.

TRANSACTIONS
Contributions,  exchanges,  or redemptions of the Fund's shares are processed as
soon as they have been received by Vanguard in good order. Good order means that
your request includes complete  information on your contribution,  exchange,  or
redemption, and that Vanguard has received the appropriate assets.
     In all cases, your transaction will be based on the Fund's  next-determined
net asset value after  Vanguard  receives  your  request (or, in the case of new
contributions,  the  next-determined net asset value after Vanguard receives the
order from your plan administrator).  As long as this request is received before
the close of trading on the New York Stock  Exchange,  generally 4 p.m.  Eastern
time, you will receive that day's net asset value.

EXCHANGES
The exchange  privilege (your ability to redeem shares from one fund to purchase
shares of another  fund) may be available to you through your plan.  Although we
make every  effort to maintain  the exchange  privilege,  Vanguard  reserves the
right to revise or terminate this privilege,  limit the amount of an exchange or
reject any exchange,  at any time, without notice.  Because excessive  exchanges
can potentially  disrupt the management of the Fund and increase its transaction
costs,  Vanguard  limits  participant  exchange  activity  to no more  than FOUR
SUBSTANTIVE  "ROUND TRIPS"  THROUGH THE FUND (at least 90 days apart) during any
12-month  period.  A "round  trip" is a redemption  from the Fund  followed by a
purchase back into the Fund.  "Substantive"  means a dollar amount that Vanguard
determines, in its sole discretion, could adversely affect the management of the
Fund.
     Before  making an exchange to or from another fund  available in your plan,
consider the following:
- -    Certain investment options,  particularly funds made up of company stock or
     investment contracts, may be subject to unique restrictions.

- -    Make sure to read that fund's prospectus.  Contact  Vanguard's  Participant
     Access Center, toll-free, at 1-800-523-1188 for a copy.

- -    Vanguard can accept exchanges only as permitted by your plan.  Contact your
     plan  administrator for details on the exchange policies that apply to your
     plan.
<PAGE>

                                                                              19

ACCESSING FUND INFORMATION BY COMPUTER
- --------------------------------------------------------------------------------
VANGUARD ON THE WORLD WIDE WEB www.vanguard.com
Use your personal computer to visit Vanguard's education-oriented website, which
provides  timely news and  information  about  Vanguard  funds and services;  an
online  "university"  that  offers  a  variety  of  mutual  fund  classes;   and
easy-to-use,  interactive  tools to help you  create  your  own  investment  and
retirement strategies.
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GLOSSARY OF INVESTMENT TERMS

ACTIVE MANAGEMENT
An investment approach that seeks to exceed the average returns of the financial
markets.  Active  managers  rely on research,  market  forecasts,  and their own
judgment and experience in selecting securities to buy and sell.

BALANCED FUND
A mutual fund that seeks to provide some combination of income,  capital growth,
and conservation of capital by investing in stocks,  bonds,  and/or money market
instruments.

BOND
A debt security (IOU) issued by a corporation,  government, or government agency
in exchange for the money you lend it. In most  instances,  the issuer agrees to
pay back the loan by a specific date and to make regular interest payments until
that date.

CAPITAL GAINS DISTRIBUTION
Payment to mutual fund  shareholders of gains realized on securities that a fund
has sold at a profit, minus any realized losses.

CREDIT QUALITY
A measure of a bond  issuer's  ability to pay interest and principal in a timely
manner.

DIVIDEND INCOME
Payment to  shareholders  of income from  interest or  dividends  generated by a
fund's investments.

DURATION
A measure of the  sensitivity  of bond--and bond  fund--prices  to interest rate
movements.  For example,  if a bond has a duration of two years, its price would
fall by about 2% when interest  rates rose one  percentage  point.  On the other
hand,  the bond's price would rise by about 2% when  interest  rates fell by one
percentage point.

EXPENSE RATIO
The  percentage  of a fund's  average net assets used to pay its  expenses.  The
expense ratio  includes  management  fees,  administrative  fees,  and any 12b-1
distribution fees.

FACE VALUE
The  amount to be paid at  maturity  of a bond;  also  known as the par value or
principal.

INDEX
An unmanaged group of securities whose overall performance is used as a standard
to measure investment performance.

INVESTMENT GRADE
A bond whose credit quality is considered by independent bond-rating agencies to
be sufficient to ensure timely  payment of principal and interest  under current
economic  circumstances.  Bonds rated in one of the four highest  categories are
considered "investment grade."

MATURITY
The date when a bond issuer agrees to repay the bond's principal, or face value,
to the bond's buyer.

NET ASSET VALUE (NAV)
The market value of a mutual fund's total assets, minus liabilities,  divided by
the  number of shares  outstanding.  The value of a single  share is called  its
share value or share price.

PASSIVE MANAGEMENT
A low-cost  investment strategy in which a mutual fund attempts to match--rather
than  outperform--  a  particular  stock or bond  market  index.  Also  known as
indexing.

PRICE/EARNINGS (P/E) RATIO
The current share price of a stock,  divided by its per-share earnings (profits)
from the past year. A stock selling for $20, with earnings of $2 per share,  has
a price/earnings ratio of 10.

TOTAL RETURN
A percentage change,  over a specified time period, in a mutual fund's net asset
value,  with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.

VOLATILITY
The  fluctuations  in value of a mutual  fund or other  security.  The greater a
fund's volatility, the wider the fluctuations between its high and low prices.

YIELD
Income  (interest  or  dividends)  earned  by  an  investment,  expressed  as  a
percentage of the investment's price.
<PAGE>

                                                     [SHIP]
                                                     [THE VANGUARD GROUP(R)]
                                                     Institutional Division
                                                     Post Office Box 2900
                                                     Valley Forge, PA 19482-2900


FOR MORE INFORMATION
If you'd like more information about
Vanguard Balanced Index Fund, the
following documents are available
free upon request:

ANNUAL/SEMIANNUAL REPORTS
TO SHAREHOLDERS
Additional information about the
Fund's investments is available in
the Fund's annual and semiannual
reports to shareholders.

STATEMENT OF ADDITIONAL
INFORMATION (SAI)
The SAI provides more detailed
information about the Fund.

The current annual and semiannual
reports and the SAI are
incorporated by reference into
(and are thus legally a part of)
this prospectus.

To receive a free copy of the latest
annual or semiannual report or the
SAI, or to request additional
information about the Fund or other
Vanguard funds, please contact us
as follows:

THE VANGUARD GROUP

PARTICIPANT ACCESS CENTER

P.O. BOX 2900
VALLEY FORGE, PA 19482-2900

TELEPHONE:
1-800-523-1188

TEXT TELEPHONE:
1-800-523-8004

WORLD WIDE WEB:
WWW.VANGUARD.COM

INFORMATION PROVIDED BY THE
SECURITIES AND EXCHANGE
COMMISSION (SEC)

You can review and copy information
about the Fund (including the SAI) at
the SEC's Public Reference Room in
Washington, DC. To find out more
about this public service, call the
SEC at 1-202-942-8090. Reports and
other information about the Fund are
also available on the SEC's website
(www.sec.gov), or you can receive
copies of this information, for a fee,
by electronic request at the
following e-mail address:
[email protected], or by writing the
Public Reference Section, Securities
and Exchange Commission,
Washington, DC 20549-0102.


Fund's Investment Company Act
file number: 811-7023

(C) 2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation,
Distributor.

I002N-04/07/2000
<PAGE>

                                     PART B

                          VANGUARD BALANCED INDEX FUND
                                   (THE FUND)

                       STATEMENT OF ADDITIONAL INFORMATION

                                  APRIL 7, 2000

This Statement is not a prospectus  but should be read in  conjunction  with the
Fund's current Prospectus (dated April 7, 2000). To obtain,  without charge, the
Prospectus or the most recent Annual Report to Shareholders,  which contains the
Fund's financial statements as hereby incorporated by reference, please call:

                        INVESTOR INFORMATION DEPARTMENT:
                                 1-800-662-7447

                               TABLE OF CONTENTS

DESCRIPTION OF THE FUND......................................................B-1
INVESTMENT POLICIES..........................................................B-3
FUNDAMENTAL INVESTMENT LIMITATIONS...........................................B-7
YIELD AND TOTAL RETURN.......................................................B-9
PURCHASE OF SHARES..........................................................B-10
SHARE PRICE.................................................................B-11
REDEMPTION OF SHARES........................................................B-12
MANAGEMENT OF THE FUND......................................................B-12
PORTFOLIO TRANSACTIONS......................................................B-15
FINANCIAL STATEMENTS........................................................B-16
COMPARATIVE INDEXES.........................................................B-16
APPENDIX A--DESCRIPTION OF BOND RATINGS.....................................B-19


                            DESCRIPTION OF THE FUND

ORGANIZATION

Vanguard  Balanced Index Fund is a Delaware  business  trust.  It was originally
organized as a Maryland  corporation in 1992, and was  reorganized as a Delaware
business  trust in July  1998.  More than one fund may be  offered  through  the
Trust;  currently the Trust only offers the following  fund:  Vanguard  Balanced
Index Fund (the Fund).  Throughout  this  Statement  of  Additional  Information
references  will be made to both the Trust and the Fund  offered  by the  Trust.
Prior to its  reorganization as a Delaware business trust, the Fund was known as
Vanguard Balanced Index Fund, Inc. The Fund is registered with the United States
Securities and Exchange Commission (the Commission) under the Investment Company
Act of 1940 (the  1940 Act) as an  open-end  diversified  management  investment
company.  The Fund has the  ability  to offer  additional  funds or  classes  of
shares.  There is no limit on the number of full and fractional  shares that the
Fund may issue for a single fund or class of shares.

SERVICE PROVIDERS

     CUSTODIAN.   First  Union  National  Bank,   PA4943,   530  Walnut  Street,
Philadelphia,  Pennsylvania 19106, serves as the Fund's custodian. The custodian
is  responsible  for  maintaining  the Fund's  assets and keeping all  necessary
accounts and records of Fund assets.

     INDEPENDENT ACCOUNTANTS.  PricewaterhouseCoopers LLP, 30 South 17th Street,
Philadelphia,  Pennsylvania 19103, serves as the Fund's independent accountants.
The  accountants  audit  financial  statements  for the Fund and  provide  other
related services.

                                       B-1
<PAGE>

     TRANSFER AND DIVIDEND-PAYING AGENT. The Fund's transfer and dividend-paying
agent is The Vanguard Group, Inc., 100 Vanguard Boulevard, Malvern, Pennsylvania
19355.

CHARACTERISTICS OF THE FUND'S SHARES

     RESTRICTIONS  ON HOLDING OR DISPOSING OF SHARES.  There are no restrictions
on the right of  shareholders  to retain or dispose of the Fund's shares,  other
than the possible future  termination of the Fund. The Fund may be terminated by
reorganization  into another mutual fund or by liquidation  and  distribution of
the  assets  of the  affected  fund.  Unless  terminated  by  reorganization  or
liquidation, the Fund will continue indefinitely.

     SHAREHOLDER  LIABILITY.  The Fund is organized  under  Delaware law,  which
provides  that  shareholders  of a  business  trust  are  entitled  to the  same
limitations of personal  liability as  shareholders  of a corporation  organized
under Delaware law. Effectively,  this means that a shareholder of the Fund will
not be personally liable for payment of the Fund's debts except by reason of his
or her own conduct or acts. In addition,  a shareholder  could incur a financial
loss on account of a Fund  obligation  only if the Fund itself had no  remaining
assets with which to meet such  obligation.  We believe that the  possibility of
such a situation arising is extremely remote.

     DIVIDEND  RIGHTS.  The  shareholders  of a fund are entitled to receive any
dividends or other distributions declared for such fund. No shares have priority
or  preference  over  any  other  shares  of  the  same  fund  with  respect  to
distributions. Distributions will be made from the assets of a fund, and will be
paid ratably to all  shareholders of the fund (or class) according to the number
of shares of such fund (or class) held by  shareholders  on the record date. The
amount of income  dividends per share may vary between separate share classes of
the same fund based upon  differences  in the way that  expenses  are  allocated
between share classes pursuant to a multiple class plan.

     VOTING  RIGHTS.  Shareholders  are  entitled  to vote on a matter if: (i) a
shareholder  vote is required  under the 1940 Act;  (ii) the matter  concerns an
amendment to the Declaration of Trust that would adversely  affect to a material
degree the rights and  preferences  of the shares of any class or fund; or (iii)
the Trustees determine that it is necessary or desirable to obtain a shareholder
vote.  The 1940 Act requires a  shareholder  vote under  various  circumstances,
including to elect or remove  Trustees upon the written  request of shareholders
representing 10% or more of the Fund's net assets, and to change any fundamental
policy of the Fund. Shareholders of the Fund receive one vote for each dollar of
net  asset  value  owned on the  record  date,  and a  fractional  vote for each
fractional dollar of net asset value owned on the record date. However, only the
shares of the fund affected by a particular  matter are entitled to vote on that
matter.  Voting  rights  are  noncumulative  and  cannot be  modified  without a
majority vote.

     LIQUIDATION  RIGHTS.  In the  event of  liquidation,  shareholders  will be
entitled to receive a pro rata share of the Fund's net assets.

     PREEMPTIVE  RIGHTS.  There are no  preemptive  rights  associated  with the
Fund's shares.

     CONVERSION  RIGHTS.  There are no  conversion  rights  associated  with the
Fund's shares.

     REDEMPTION  PROVISIONS.  The Fund's redemption  provisions are described in
its  current   prospectus   and  elsewhere  in  this   Statement  of  Additional
Information.

     SINKING FUND PROVISIONS. The Fund has no sinking fund provisions.

     CALLS OR  ASSESSMENT.  The Fund's shares,  when issued,  are fully paid and
non-assessable.

TAX STATUS OF THE FUND

The Fund  intends to continue  to qualify as a  "regulated  investment  company"
under  Subchapter M of the Internal  Revenue Code. This special tax status means
that the Fund will not be liable for  federal  tax on income and  capital  gains
distributed to shareholders.  In order to preserve its tax status, the Fund must
comply with certain  requirements.  If the Fund fails to meet these requirements
in any  taxable  year,  it will  be  subject  to tax on its  taxable  income  at
corporate rates,

                                       B-2
<PAGE>

and all distributions from earnings and profits,  including any distributions of
net  tax-exempt  income  and net  long-term  capital  gains,  will be taxable to
shareholders  as ordinary  income.  In  addition,  the Fund could be required to
recognize  unrealized  gains,  pay  substantial  taxes  and  interest,  and make
substantial  distributions  before  regaining  its  tax  status  as a  regulated
investment company.


                              INVESTMENT POLICIES

The following policies supplement the Fund's investment policies as set forth in
the Prospectus.

     REPURCHASE  AGREEMENTS.  The Fund may invest in repurchase  agreements with
commercial  banks,  brokers,  or dealers to generate income from its excess cash
balances. A repurchase agreement is an agreement under which the Fund acquires a
fixed-income  security (generally a security issued by the U.S. Government or an
agency  thereof,  a banker's  acceptance  or a  certificate  of deposit)  from a
Federal  Reserve  member  bank with  minimum  assets of at least $2 billion or a
registered securities dealer,  subject to resale to the seller at an agreed upon
price and date (normally,  the next business day). A repurchase agreement may be
considered a loan  collateralized  by  securities.  The resale price reflects an
agreed upon interest rate effective for the period the instrument is held by the
Fund and is unrelated  to the interest  rate on the  underlying  instrument.  In
these  transactions,  the  securities  acquired by the Fund  (including  accrued
interest  earned  thereon) must have a total value in excess of the value of the
repurchase   agreement  and  are  held  by  the  Fund's   custodian  bank  until
repurchased.  In addition,  the Fund's Board of Trustees will monitor the Fund's
repurchase  agreement  transactions  generally and will establish guidelines and
standards  for review of the  creditworthiness  of any bank,  broker,  or dealer
party to a repurchase agreement with the Fund.

     The use of repurchase  agreements  involves certain risks. For example,  if
the other party to the agreement  defaults on its  obligation to repurchase  the
underlying  security at a time when the value of the security has declined,  the
Fund may incur a loss upon  disposition  of the security.  If the other party to
the agreement  becomes  insolvent and subject to liquidation  or  reorganization
under  bankruptcy  or other  laws,  a court may  determine  that the  underlying
security is collateral for a loan by the Fund not within the control of the Fund
and  therefore  the Fund may not be able to  substantiate  its  interest  in the
underlying  security and may be deemed an unsecured  creditor of the other party
to the agreement.  While the adviser  acknowledges  these risks,  it is expected
that they will be controlled through careful monitoring procedures.


     LENDING  OF  SECURITIES.  The Fund may lend  its  securities  to  qualified
institutional  investors (typically brokers,  dealers,  banks or other financial
institutions)  who  need to  borrow  securities  in order  to  complete  certain
transactions,  such as  covering  short  sales,  avoiding  failures  to  deliver
securities  or  completing  arbitrage  operations.   By  lending  its  portfolio
securities,  the Fund attempts to increase its net investment income through the
receipt of  interest  on the loan.  Any gain or loss in the market  price of the
securities  loaned that might occur during the term of the loan would be for the
account of the Fund. The terms, the structure,  and the aggregate amount of such
loans must be consistent with the 1940 Act, and the rules or  interpretations of
the Commission  thereunder.  These provisions limit the amount of securities the
fund may lend to 33 1/3% of the Fund's  total  assets,  and require that (a) the
borrower  pledge and maintain  with the Fund  collateral  consisting  of cash, a
letter of  credit  issued by a  domestic  U.S.  bank,  or  securities  issued or
guaranteed  by the United  States  Government  having at all times not less than
100%  of the  value  of the  securities  loaned,  (b) the  borrower  add to such
collateral whenever the price of the securities loaned rises (i.e., the borrower
"marks  to the  market"  on a daily  basis),  (c) the  loan be made  subject  to
termination by the Fund at any time and (d) the Fund receive reasonable interest
on the loan (which may  include  the Fund's  investing  any cash  collateral  in
interest  bearing  short-term  investments),  any  distribution  on  the  loaned
securities and any increase in their market value. Loan arrangements made by the
Fund will comply with all other applicable  regulatory  requirements,  including
the rules of the New York Stock Exchange (the  Exchange),  which rules presently
require the borrower,  after  notice,  to redeliver  the  securities  within the
normal settlement time of three business days. All relevant facts and


                                       B-3
<PAGE>


circumstances,   including  the  creditworthiness  of  the  broker,  dealer,  or
institution,  will be considered in making decisions with respect to the lending
of securities, subject to review by the Fund's Board of Trustees.


     VANGUARD INTERFUND LENDING PROGRAM.  The Commission has issued an exemptive
order  permitting the Fund and other Vanguard funds to participate in Vanguard's
interfund  lending  program.  This program  allows the Vanguard  funds to borrow
money from and loan money to each other for temporary or emergency purposes. The
program is subject to a number of conditions,  including the requirement that no
fund may borrow or lend money  through  the  program  unless it  receives a more
favorable  interest rate than is available  from a typical bank for a comparable
transaction. In addition, a Vanguard fund may participate in the program only if
and to the  extent  that  such  participation  is  consistent  with  the  fund's
investment  objective and other investment  policies.  The Boards of Trustees of
the Vanguard  funds are  responsible  for ensuring  that the  interfund  lending
program operates in compliance with all conditions of the Commission's exemptive
order.


     FUTURES  CONTRACTS,  OPTIONS ON FUTURES  CONTRACTS,  WARRANTS,  CONVERTIBLE
SECURITIES,  AND SWAP  AGREEMENTS.  The Fund may enter into  futures  contracts,
warrants,  options  on  futures  contracts,  convertible  securities,  and  swap
agreements  for the purpose of  simulating  full  investment  in the  underlying
Indexes and reducing transaction costs. Futures contracts provide for the future
sale by one party and  purchase  by  another  party of a  specified  amount of a
specific  security at a specified future time and at a specified price.  Futures
contracts which are  standardized  as to maturity date and underlying  financial
instrument  are traded on national  futures  exchanges.  Futures  exchanges  and
trading are regulated under the Commodity  Exchange Act by the Commodity Futures
Trading Commission (CFTC), a U.S. Government agency. Assets committed to futures
contracts will be segregated to the extent required by law.


     Although  futures  contracts  by their  terms call for actual  delivery  or
acceptance of the underlying securities,  in most cases the contracts are closed
out before the settlement date without the making or taking of delivery. Closing
out an open futures position is done by taking an opposite position  ("buying" a
contract which has previously  been "sold",  or "selling" a contract  previously
purchased)  in an  identical  contract  to  terminate  the  position.  Brokerage
commissions are incurred when a futures contract is bought or sold.

     Futures traders are required to make a good faith initial margin deposit in
cash or  securities  with a broker or custodian  to initiate  and maintain  open
positions  in  futures  contracts.  A  margin  deposit  is  intended  to  assure
completion of the contract  (delivery or acceptance of the underlying  security)
if it is not terminated  prior to the specified  delivery date.  Minimal initial
margin  requirements are established by the futures exchange and may be changed.
Brokers may establish  deposit  requirements  which are higher than the exchange
minimums.  Futures  contracts are  customarily  purchased and sold with deposits
that may range  upward  from less  than 5% of the  value of the  contract  being
traded.  The Fund's initial margin requirement is ordinarily in the form of U.S.
Treasury securities.

     After a futures contract  position is opened,  the value of the contract is
marked to market daily. If the futures contract price changes to the extent that
the  margin  on  deposit  does  not  satisfy  margin  requirements,  payment  of
additional  "variation"  margin  will be  required.  Conversely,  change  in the
contract  value may reduce the  required  margin,  resulting  in a repayment  of
excess margin to the contract holder.  Variation margin payments are made to and
from the  futures  broker for as long as the  contract  remains  open.  The Fund
expects to earn interest income on its initial margin deposits.

     Traders in futures contracts may be broadly  classified as either "hedgers"
or   "speculators".   Hedgers  use  the  futures  markets  primarily  to  offset
unfavorable  changes in the value of securities  otherwise  held for  investment
purposes or expected to be acquired by them.  Speculators  are less  inclined to
own the securities  underlying the futures  contracts which they trade,  and use
futures contracts with the expectation of realizing profits from fluctuations in
the prices of underlying  securities.  The Fund intends to use futures contracts
only for bona fide hedging purposes.

                                      B-4
<PAGE>

     Regulations  of the CFTC  applicable  to the Fund  require  that all of its
futures  transactions  constitute bona fide hedging  transactions  except to the
extent that the aggregate initial margins and premiums required to establish any
non-hedging  positions do not exceed five percent of the value of the Fund.  The
Fund will only sell  futures  contracts  to protect  securities  it owns against
price declines or purchase contracts to protect against an increase in the price
of securities it intends to purchase. As evidence of this hedging interest,  the
Fund expects that  approximately  75% of its futures contract  purchases will be
"completed",  that is, equivalent  amounts of related  securities will have been
purchased  or are  being  purchased  by the  Fund  upon  sale  of  open  futures
contracts.

     Although  techniques other than the sale and purchase of futures  contracts
could be used to control the Fund's exposure to market fluctuations,  the use of
futures contracts may be a more effective means of hedging this exposure.  While
the Fund will incur commission  expenses in both opening and closing out futures
positions, these costs are lower than transaction costs incurred in the purchase
and sale of the underlying securities.

     Restrictions on the Use of Futures Contracts.  The Fund will not enter into
futures contract transactions to the extent that,  immediately  thereafter,  the
sum of its initial margin  deposits on open  contracts  exceeds 5% of the market
value of the Fund's total assets.


     Risk Factors in Futures Transactions. Positions in futures contracts may be
closed  out only on an  exchange  which  provides  a  secondary  market for such
futures.  However, there can be no assurance that a liquid secondary market will
exist for any particular futures contract at any specific time. Thus, it may not
be  possible  to  close a  futures  position.  In the  event  of  adverse  price
movements, the Fund would continue to be required to make daily cash payments to
maintain its required margin.  In such situations,  if the Fund has insufficient
cash, it may have to sell portfolio securities to meet daily margin requirements
at a time when it may be disadvantageous to do so. In addition,  the Fund may be
required to make delivery of the  instruments  underlying  futures  contracts it
holds.  The inability to close options and futures  positions also could have an
adverse impact on the ability to effectively hedge.


     The Fund  will  minimize  the risk  that it will be  unable  to close out a
futures  contract by only  entering  into  futures  which are traded on national
futures exchanges and for which there appears to be a liquid secondary market.


     The risk of loss in trading  futures  contracts in some  strategies  can be
substantial,  due both to the low margin  deposits  required,  and the extremely
high degree of leverage  involved in futures pricing.  As a result, a relatively
small  price  movement  in a  futures  contract  may  result  in  immediate  and
substantial loss (as well as gain) to the investor.  For example, if at the time
of purchase,  10% of the value of the futures contract is deposited as margin, a
subsequent  10% decrease in the value of the futures  contract would result in a
total  loss of the margin  deposit,  before any  deduction  for the  transaction
costs,  if the account  were then closed out. A 15%  decrease  would result in a
loss equal to 150% of the original  margin  deposit if the contract  were closed
out.  Thus,  a purchase  or sale of a futures  contract  may result in losses in
excess of the amount invested in the contract. The Fund also bears the risk that
the adviser  will  incorrectly  predict  future stock  market  trends.  However,
because  the  futures  strategies  of the Fund are  engaged in only for  hedging
purposes,  the  adviser  does not  believe  that the Fund will be subject to the
risks of loss frequently  associated with futures  transactions.  The Fund would
presumably have sustained comparable losses if, instead of the futures contract,
it had invested in the  underlying  financial  instrument  and sold it after the
decline.


     Utilization  of futures  transactions  by the Fund does involve the risk of
imperfect or no correlation  where the securities  underlying  futures contracts
have different maturities than the portfolio securities being hedged. It is also
possible  that the Fund  could both lose  money on  futures  contracts  and also
experience  a decline in value of its  portfolio  securities.  There is also the
risk of loss by the Fund of  margin  deposits  in the event of  bankruptcy  of a
broker with whom the Fund has an open position in a futures  contract or related
option.

     Most futures exchanges limit the amount of fluctuation permitted in futures
contract  prices during a single  trading day. The daily limit  establishes  the
maximum amount that the price of a

                                      B-5
<PAGE>

futures  contract may vary either up or down from the previous day's  settlement
price at the end of a trading session.  Once the daily limit has been reached in
a  particular  type of  contract,  no trades  may be made on that day at a price
beyond  that  limit.  The daily  limit  governs  only  price  movement  during a
particular  trading day and therefore does not limit potential  losses,  because
the limit may prevent the liquidation of unfavorable positions. Futures contract
prices  have  occasionally  moved to the  daily  limit for  several  consecutive
trading days with little or no trading, thereby preventing prompt liquidation of
future positions and subjecting some futures traders to substantial losses.

     FEDERAL  TAX  TREATMENT  OF FUTURES  CONTRACTS.  The Fund is  required  for
federal income tax purposes to recognize as income for each taxable year its net
unrealized  gains and losses on certain  futures  contracts as of the end of the
year as well as those  actually  realized  during the year. In these cases,  any
gain or loss recognized  with respect to a futures  contract is considered to be
60%  long-term  capital  gain or loss and 40%  short-term  capital gain or loss,
without  regard to the  holding  period  of the  contract.  Gains and  losses on
certain other futures contracts  (primarily non-U.S.  futures contracts) are not
recognized  until the  contracts  are closed and are  treated  as  long-term  or
short-term  depending on the holding  period of the  contract.  Sales of futures
contracts  which  are  intended  to  hedge  against  a  change  in the  value of
securities  held by a Fund may affect the holding period of such securities and,
consequently,   the  nature  of  the  gain  or  loss  on  such  securities  upon
disposition.  A Fund may be  required  to defer  the  recognition  of  losses on
futures  contracts to the extent of any unrecognized  gains on related positions
held by the Fund.

     In order for a Fund to continue to qualify for federal income tax treatment
as a  regulated  investment  company,  at least  90% of its gross  income  for a
taxable year must be derived from qualifying income; i.e., dividends,  interest,
income derived from loans of securities, gains from the sale of securities or of
foreign  currencies or other income derived with respect to the Fund's  business
of investing in securities or currencies.  It is  anticipated  that any net gain
recognized  on  futures  contracts  will be  considered  qualifying  income  for
purposes of the 90% requirement.

     The Fund will  distribute  to  shareholders  annually any net capital gains
which  have  been   recognized  for  federal  income  tax  purposes  on  futures
transactions.  Such distributions will be combined with distributions of capital
gains realized on the Fund's other  investments and shareholders will be advised
on the nature of the distributions.


     FEDERAL TAX  TREATMENT OF NON-U.S.  TRANSACTIONS.  Special rules govern the
Federal income tax treatment of certain  transactions  denominated in terms of a
currency  other than the U.S.  dollar or determined by reference to the value of
one or more  currencies  other than the U.S.  dollar.  The types of transactions
covered by the special rules include the following:  (i) the  acquisition of, or
becoming the obligor under, a bond or other debt instrument  (including,  to the
extent provided in Treasury regulations,  preferred stock); (ii) the accruing of
certain  trade  receivables  and  payables;  and  (iii)  the  entering  into  or
acquisition  of any  forward  contract,  futures  contract,  option  or  similar
financial instrument if such instrument is not marked to market. The disposition
of a currency other than the U.S. dollar by a taxpayer whose functional currency
is the U.S.  dollar is also  treated as a  transaction  subject  to the  special
currency rules. However,  foreign  currency-related  regulated futures contracts
and nonequity options are generally not subject to the special currency rules if
they are or would be  treated as sold for their fair  market  value at  year-end
under the  marking-to-market  rules applicable to other futures contracts unless
an  election  is made  to have  such  currency  rules  apply.  With  respect  to
transactions  covered by the special  rules,  foreign  currency  gain or loss is
calculated separately from any gain or loss on the underlying transaction and is
normally  taxable as ordinary  income or loss.  A taxpayer may elect to treat as
capital  gain or  loss  foreign  currency  gain or  loss  arising  from  certain
identified  forward  contracts,  futures  contracts and options that are capital
assets in the hands of the  taxpayer  and which are not part of a straddle.  The
Treasury Department issued regulations under which certain  transactions subject
to  the  special  currency  rules  that  are  part  of a  "section  988  hedging
transaction" (as defined in the Internal  Revenue Code of 1986, as amended,  and
the Treasury regulations) will be integrated and treated as a single transaction
or otherwise  treated  consistently  for purposes of the Code.  Any gain or loss
attributable to the foreign currency component of a transaction  engaged in by a
fund which is not


                                      B-6
<PAGE>


subject to the special currency rules (such as foreign equity  investments other
than certain  preferred stocks) will be treated as capital gain or loss and will
not be segregated  from the gain or loss on the  underlying  transaction.  It is
anticipated that some of the non-U.S. dollar-denominated investments and foreign
currency  contracts  the  Fund may make or enter  into  will be  subject  to the
special currency rules described above.


     ILLIQUID  SECURITIES.  The Fund may  invest up to 15% of its net  assets in
illiquid securities.  Illiquid securities are securities that may not be sold or
disposed of in the ordinary  course of business  within seven  business  days at
approximately the value at which they are being carried on the Fund's books.

     The Fund may invest in restricted,  privately placed securities that, under
securities  laws, may be sold only to qualified  institutional  buyers.  Because
these securities can be resold only to qualified  institutional  buyers or after
they  have been held for a number  of  years,  they may be  considered  illiquid
securities--meaning that they could be difficult for the Fund to convert to cash
if needed.

     If a  substantial  market  develops for a restricted  security  held by the
Fund, it will be treated as a liquid security, in accordance with procedures and
guidelines  approved by the Fund's Board of Trustees.  This  generally  includes
securities  that are  unregistered  that can be sold to qualified  institutional
buyers in accordance  with Rule 144A under the  Securities Act of 1933 (the 1933
Act). While the Fund's investment adviser determines the liquidity of restricted
securities  on  a  daily  basis,   the  Board  oversees  and  retains   ultimate
responsibility  for the  adviser's  decisions.  Several  factors  that the Board
considers in monitoring these decisions include the valuation of a security, the
availability  of  qualified   institutional  buyers,  and  the  availability  of
information about the security's issuer.

     FOREIGN  INVESTMENTS.  The Fund will invest in securities issued by foreign
governments, companies, and agencies.

     The Fund is,  therefore,  subject to country risk, which is the possibility
that political  events (such as a war),  financial  problems (such as government
default),  or natural  disasters (such as an earthquake) will weaken a country's
economy and cause securities issued by entities in that country to lose money.

     As foreign  companies  are not  generally  subject  to uniform  accounting,
auditing,  and financial reporting  standards and practices  comparable to those
applicable  to  domestic  companies,   there  may  be  less  publicly  available
information  about certain  foreign  companies  than about  domestic  companies.
Securities of some foreign companies are generally less liquid and more volatile
than  securities  of  comparable  domestic  companies.  There is generally  less
government  supervision and regulation of foreign stock exchanges,  brokers, and
listed  companies than in the U.S. In addition,  with respect to certain foreign
countries,  there is the possibility of expropriation or confiscatory  taxation,
political or social instability,  or diplomatic  developments which could affect
U.S. investments in those countries.


                       FUNDAMENTAL INVESTMENT LIMITATIONS

The Fund is subject to the following fundamental investment  limitations,  which
cannot be changed in any  material  way without the approval of the holders of a
majority of the Fund's shares.  For these  purposes,  a "majority" of the Fund's
shares  means shares  representing  the lesser of: (i) 67% or more of the Fund's
net asset value, so long as shares  representing more than 50% of the Fund's net
asset value are present or  represented  by proxy;  or (ii) more than 50% of the
Fund's net asset value.

     BORROWING. The Fund may not borrow money, except for temporary or emergency
purposes in an amount not exceeding  15% of the Fund's net assets.  The Fund may
borrow  money  through  banks,  reverse  repurchase  agreements,  or  Vanguard's
interfund  lending program only, and must comply with all applicable  regulatory
conditions.  The  Fund  may not make any  additional  investments  whenever  its
outstanding borrowings exceed 5% of net assets.

                                      B-7
<PAGE>

     COMMODITIES.  The Fund may not invest in  commodities,  except  that it may
invest in bond and stock futures  contracts,  bond and stock options and options
on bond and stock futures contracts.  No more than 5% of the Fund's total assets
may be used as initial  margin deposit for futures  contracts,  and no more than
20% of the Fund's total assets my be invested in futures contracts or options at
any time.

     DIVERSIFICATION. With respect to 75% of its total assets, the Fund may not:
(i)  purchase  more than 10% of the  outstanding  voting  securities  of any one
issuer; or (ii) purchase  securities of any issuer if, as a result, more than 5%
of the Fund's total assets would be invested in that issuer's  securities.  This
limitation  does not apply to obligations of the United States  Government,  its
agencies, or instrumentalities.

     ILLIQUID SECURITIES. The Fund may not acquire any security if, as a result,
more  than  15% of its net  assets  would be  invested  in  securities  that are
illiquid.

     INDUSTRY CONCENTRATION.  The Fund may not invest more than 25% of its total
assets in any one industry.

     INVESTING FOR CONTROL. The Fund may not invest in a company for purposes of
controlling its management.

     INVESTMENT  COMPANIES.  The Fund may not  invest  in any  other  investment
company, except through a merger,  consolidation or acquisition of assets, or to
the extent permitted by Section 12 of the 1940 Act.  Investment  companies whose
shares the Fund acquires pursuant to Section 12 must have investment  objectives
and investment policies consistent with those of the Fund.

     LOANS.  The Fund may not lend  money to any  person  except  by  purchasing
fixed-income  securities or by entering into repurchase agreements,  lending its
portfolio securities, or through Vanguard's interfund lending program.

     MARGIN.  The Fund may not purchase  securities on margin or sell securities
short,  except as  permitted  by the  Fund's  investment  policies  relating  to
commodities.

     OIL,  GAS,  MINERALS.  The Fund may not invest in interests in oil, gas, or
other mineral exploration or development programs.

     PLEDGING  ASSETS.  The Fund may not pledge,  mortgage,  or hypothecate more
than 15% of its net assets.

     REAL ESTATE.  The Fund may not invest directly in real estate,  although it
may invest in securities of companies that deal in real estate and bonds secured
by real estate.

     RELATED  PARTY  TRANSACTIONS.  The Trust may not have dealings on behalf of
the Trust  with  officers  and  Trustees,  except  for the  purchase  or sale of
securities on an agency or commission basis. The Trust may not make loans to any
officers, Trustees, or employees of the Trust.

     SENIOR  SECURITIES.  The Fund may not issue  senior  securities,  except in
compliance with the 1940 Act.

     UNDERWRITING.  The Fund may not  engage  in the  business  of  underwriting
securities  issued  by  other  persons.  The  Fund  will  not be  considered  an
underwriter when disposing of its investment securities.

     None of these  limitations  prevents  the Fund  from  participating  in The
Vanguard Group (Vanguard). As a member of the Group, the Fund may own securities
issued by Vanguard,  make loans to Vanguard,  and contribute to Vanguard's costs
or  other  financial  requirement.   See  "Management  of  the  Fund"  for  more
information.

     Compliance  with the investment  limitations set forth above is measured at
the time the  investment is made, a later change in percentage  resulting from a
change in the market  value of assets will not  constitute  a violation  of such
restriction.

                                      B-8
<PAGE>

                             YIELD AND TOTAL RETURN

Yields  are  calculated   daily  and  premiums  and  discounts  on  asset-backed
securities are not amortized.

     The yield of the Fund for the 30 days ended  December  31,  1999 was 3.21%.
The  average  annual  total  return of the Fund for the one and five years ended
December  31, 1999 and since  November 9, 1992 was 13.61%,  19.13%,  and 14.89%,
respectively.  Performance  figures are not adjusted for the $10 annual  account
maintenance fee.

AVERAGE ANNUAL TOTAL RETURN

Average annual total return is the average annual  compounded rate of return for
the periods of one year,  five years,  ten years,  or the life of the Fund,  all
ended on the last day of a recent month.  Average annual total return quotations
will  reflect  changes  in the price of the Fund's  shares  and assume  that all
dividends and capital gains  distributions  during the  respective  periods were
reinvested in Fund shares.

     Average  annual total return is  calculated  by finding the average  annual
compounded  rates of  return of a  hypothetical  investment  over  such  periods
according  to the  following  formula  (average  annual  total  return  is  then
expressed as a percentage):

                                T = (ERV/P)(1/N)-1

  Where:

            T = average annual total return.
            P = a hypothetical initial investment of $1,000.
            n = number of years.
          ERV = ending redeemable value: ERV is the value, at the end of the
                applicable period, of a hypothetical $1,000 investment made
                at the beginning of the applicable period.

AVERAGE ANNUAL AFTER-TAX TOTAL RETURN QUOTATION

We calculate the Fund's  average  annual  after-tax  total return by finding the
average annual  compounded  rate of return over the 1-, 5-, and 10-year  periods
(or for periods of the Fund's  operations)  that would equate the initial amount
invested to the after-tax value, according to the following formulas:

After-tax return:

                                 P (1+T)(N)= ATV

  Where:

            P = a hypothetical initial payment of $1,000
            T = average annual after-tax return
            n = number of years
          ATV = after-tax value at the end of the 1-, 5-, or 10-year
                periods of a hypothetical $1,000 payment made at the
                beginning of the time period, assuming no liquidation
                of the investment at the end of the measurement
                periods.

Instructions.

1.Assume all  distributions  by the Fund are  reinvested--less  the taxes due on
  such  distributions--at the price on the reinvestment dates during the period.
  Adjustments may be made for subsequent re-characterizations of distributions.

2.Calculate the taxes due on  distributions  by the Fund by applying the highest
  federal  marginal  tax rates to each  component  of the  distributions  on the
  reinvestment date (e.g.,  ordinary income,  short-term capital gain, long-term
  capital gain, etc.). For periods after December 31,

                                      B-9
<PAGE>

  1997, the federal  marginal tax rates used for the  calculations are 39.6% for
  ordinary  income and  short-term  capital gains and 20% for long-term  capital
  gains.  Note that the  applicable  tax  rates  may vary  over the  measurement
  period.  Assume  no  taxes  are  due on  the  portions  of  any  distributions
  classified as exempt interest or non-taxable (i.e., return of capital). Ignore
  any potential tax liabilities other than federal tax liabilities  (e.g., state
  and local taxes).

3.Include all recurring fees that are charged to all shareholder  accounts.  For
  any  account  fees that vary with the size of the  account,  assume an account
  size  equal to the  Fund's  mean (or  median)  account  size.  Assume  that no
  additional  taxes or tax credits result from any redemption of shares required
  to pay such fees.

4. State the total return quotation to the nearest hundredth of one percent.

CUMULATIVE TOTAL RETURN

Cumulative  total  return is the  cumulative  rate of  return on a  hypothetical
initial  investment of $1,000 for a specified  period.  Cumulative  total return
quotations reflect changes in the price of the Fund's shares and assume that all
dividends and capital gains  distributions  during the period were reinvested in
Fund shares.  Cumulative  total return is calculated  by finding the  cumulative
rates of a return of a hypothetical  investment over such periods,  according to
the  following  formula   (cumulative  total  return  is  then  expressed  as  a
percentage):

                                  C = (ERV/P)-1

  Where:

            C = cumulative total return.
            P = a hypothetical initial investment of $1,000.
          ERV = ending redeemable value: ERV is the value, at the end of the
                applicable period, of a hypothetical $1,000 investment made
                at the beginning of the applicable period.

SEC YIELDS

Yield is the net  annualized  yield based on a  specified  30-day (or one month)
period  assuming  semiannual  compounding  of  income.  Yield is  calculated  by
dividing the net  investment  income per share  earned  during the period by the
maximum offering price per share on the last day of the period, according to the
following formula:

                         YIELD  =  2[((A-B)/CD+1)(6)-1]

  Where:

            a = dividends and interest earned during the period.
            b = expenses accrued for the period (net of reimbursements).
            c = the average daily number of shares outstanding during the
                period that were entitled to receive dividends.
            d = the maximum offering price per share on the last day of the
                period.


                               PURCHASE OF SHARES

The Fund reserves the right in its sole  discretion (i) to suspend the offerings
of its shares, (ii) to reject purchase orders when in the judgment of management
such rejection is in the best interest of the Fund, and (iii) to reduce or waive
the minimum  investment for or any other  restrictions on initial and subsequent
investments as well as redemption fees for certain  fiduciary  accounts or under
circumstances  where  certain  economies  can be achieved in sales of the Fund's
shares.

     The Fund  reserves  the right to deduct a  transaction  fee of .08% from an
investor's   cumulative   purchases  over  $100  million.  The  Fund  may  incur
substantial  transaction  costs in  absorbing  very large  investments,  and the
fee--paid directly to the Fund--is intended to protect existing

                                      B-10

<PAGE>

shareholders from being unfairly impacted by such costs. The Fund's adviser will
consider several factors in determining  whether to apply the fee, including the
following:

- -    The  transaction  costs of  buying  securities,  determined  in part by the
     availability of securities at that time.
- -    The offsetting effect of any Fund redemptions occurring at that time.
- -    The Fund's then current rate of growth.
- -    Whether  the  Fund's  corporate  substitution  strategy  provides  adequate
     additional  returns to help offset  transaction  costs  associated with the
     large investment under then current market  conditions (as discussed in the
     prospectus).

TRADING SHARES THROUGH CHARLES SCHWAB

The Fund has  authorized  Charles  Schwab & Co., Inc.  (Schwab) to accept on its
behalf purchase and redemption orders under certain terms and conditions. Schwab
is also  authorized to designate  other  intermediaries  to accept  purchase and
redemption  orders on the Fund's behalf  subject to those terms and  conditions.
Under this  arrangement,  the Fund will be deemed to have received a purchase or
redemption order when Schwab or, if applicable,  Schwab's  authorized  designee,
accepts the order in accordance  with the Fund's  instructions.  Customer orders
that are properly transmitted to the Fund by Schwab, or if applicable,  Schwab's
authorized designee, will be priced as follows:

     Orders  received by Schwab before 3 p.m.  Eastern time on any business day,
will be sent to  Vanguard  that day and your  share  price  will be based on the
Fund's  net asset  value  calculated  at the close of trading  that day.  Orders
received by Schwab after 3 p.m.  Eastern  time,  will be sent to Vanguard on the
following  business  day and your  share  price  will be based on the Fund's net
asset value calculated at the close of trading that day.


                                  SHARE PRICE

The Fund's  share  price,  or "net asset  value" per  share,  is  calculated  by
dividing the total assets of the Fund, less all liabilities, by the total number
of shares outstanding.  The net asset value is determined as of the close of the
New York Stock Exchange,  generally 4:00 p.m.  Eastern time on each day that the
Exchange is open for trading.


     Portfolio  securities  for which market  quotations  are readily  available
(including those securities listed on national securities exchanges,  as well as
those quoted on the NASDAQ Stock Market) will be valued at the last quoted sales
price on the day the valuation is made. Such securities  which are not traded on
the  valuation  date are  valued  at the mean of the bid and ask  prices.  Price
information on  exchange-listed  securities is taken from the exchange where the
security is primarily  traded.  Securities  may be valued on the basis of prices
provided by a pricing  service when such prices are believed to reflect the fair
market value of such securities.

     Short term instruments (those acquired with remaining maturities of 60 days
or less) may be valued at cost, plus or minus any amortized discount or premium,
which approximates market value.

     Bonds  and  other  fixed-income  securities  may be  valued on the basis of
prices  provided by a pricing  service  when such prices are believed to reflect
the fair  market  value of such  securities.  The prices  provided  by a pricing
service  may be  determined  without  regard to bid or last sale  prices of each
security,  but take into  account  institutional-size  transactions  in  similar
groups of securities as well as any developments related to specific securities.

     Other assets and securities  for which no quotations are readily  available
or which are restricted as to sale (or resale) are valued by such methods as the
Board of Trustees deems in good faith to reflect fair value.

                                      B-11
<PAGE>

     The share price for the Fund can be found daily in the mutual fund listings
of most major newspapers under the heading of Vanguard Index Funds.


                              REDEMPTION OF SHARES

The Fund may suspend  redemption  privileges or postpone the date of payment (i)
during any period that the New York Stock Exchange is closed,  or trading on the
Exchange is restricted as determined by the  Commission,  (ii) during any period
when an emergency exists as defined by the Commission as a result of which it is
not reasonably practicable for the Fund to dispose of securities owned by it, or
fairly to determine the value of its assets, and (iii) for such other periods as
the Commission may permit.

     The Fund  has  made an  election  with  the  Commission  to pay in cash all
redemptions  requested by any shareholder of record limited in amount during any
90-day  period to the lesser of  $250,000 or 1% of the net assets of the Fund at
the beginning of such period.

     No charge is made by the Fund for redemptions. Shares redeemed may be worth
more or less than what was paid for them,  depending  on the market value of the
securities held by the Fund.


                             MANAGEMENT OF THE FUND

OFFICERS AND TRUSTEES

The officers of the Fund manage its day-to-day operations and are responsible to
the Fund's Board of Trustees.  The Trustees set broad  policies for the Fund and
choose its officers. The following is a list of the Trustees and officers of the
Fund and a statement of their present positions and principal occupations during
the past five years. As a group,  the Fund's Trustees and officers own less than
1% of the outstanding shares of the Fund. Each Trustee also serves as a Director
of The  Vanguard  Group,  Inc.,  and as a  Trustee  of  each  of the  103  funds
administered  by Vanguard (102 in the case of Mr.  Malkiel and 93 in the case of
Mr.  MacLaury).  The mailing address of the Trustees and officers of the Fund is
Post Office Box 876, Valley Forge, PA 19482.

JOHN J. BRENNAN,(DOB: 7/29/1954) Chairman, Chief Executive Officer, and Trustee*
Chairman, Chief Executive Officer, and Director of The Vanguard Group, Inc., and
Trustee of each of the investment companies in The Vanguard Group.

JOANN HEFFERNAN HEISEN, (DOB: 1/25/1950) Trustee
Vice President, Chief Information Officer, and member of the Executive Committee
of Johnson and Johnson (Pharmaceuticals/Consumer  Products); Director of Johnson
& Johnson*MERCK  Consumer  Pharmaceuticals Co., The Medical Center at Princeton,
and Women's Research and Education Institute.

BRUCE K. MACLAURY, (DOB: 5/7/1931) Trustee
President  Emeritus  of  The  Brookings  Institution  (Independent  Non-Partisan
Research  Organization);  Director of American  Express Bank, Ltd., The St. Paul
Companies, Inc. (Insurance and Financial Services), and National Steel Corp.

BURTON G. MALKIEL, (DOB: 8/28/1932) Trustee
Chemical Bank Chairman's Professor of Economics, Princeton University;  Director
of Prudential Insurance Co. of America, Banco Bilbao Gestinova, Baker Fentress &
Co.  (Investment  Management),  The Jeffrey Co.  (Holding  Company),  and Select
Sector SPDR Trust (Exchange-Traded Mutual Fund).

ALFRED M. RANKIN, JR., (DOB: 10/8/1941) Trustee
Chairman,  President, Chief Executive Officer, and Director of NACCO Industries,
Inc.  (Machinery/Coal/Appliances);  Director  of The  BFGoodrich  Co.  (Aircraft
Systems/Manufacturing/Chemicals), and The Standard Products Co. (Rubber Products
Company).

                                      B-12
<PAGE>

JOHN C. SAWHILL, (DOB: 6/12/1936) Trustee
President  and Chief  Executive  Officer of The Nature  Conservancy  (Non-Profit
Conservation Group);  Director of Pacific Gas and Electric Co., Procter & Gamble
Co.,   NACCO   Industries,   Inc.   (Machinery/Coal/Appliances),   and  Newfield
Exploration Co.  (Energy);  formerly,  Director and Senior Partner of McKinsey &
Co., and President of New York University.

JAMES O. WELCH, JR., (DOB: 5/13/1931) Trustee
Retired Chairman of Nabisco Brands, Inc. (Food Products);  retired Vice Chairman
and  Director  of RJR  Nabisco  (Food and  Tobacco  Products);  Director of TECO
Energy, Inc., and Kmart Corp.

J. LAWRENCE WILSON, (DOB: 3/2/1936) Trustee
Retired Chairman of Rohm & Haas Co. (Chemicals);  Director of Cummins Engine Co.
(Diesel Engine Company), The Mead Corp. (Paper Products); and AmeriSource Health
Corp.; and Trustee of Vanderbilt University.

RAYMOND J. KLAPINSKY, (DOB: 12/7/1938) Secretary*
Managing Director of The Vanguard Group, Inc.;  Secretary of The Vanguard Group,
Inc. and of each of the investment companies in The Vanguard Group.

THOMAS J. HIGGINS, (DOB: 5/21/1957) Treasurer*
Principal  of The Vanguard  Group,  Inc.;  Treasurer  of each of the  investment
companies in The Vanguard Group.

ROBERT D. SNOWDEN, (DOB: 9/4/1961) Controller*
Principal of The Vanguard  Group,  Inc.;  Controller  of each of the  investment
companies in The Vanguard Group.

*Officers of the Fund are "interested persons" as defined in the 1940 Act.

THE VANGUARD GROUP

The  Fund is a  member  of the  Vanguard  Group of  Investment  Companies  which
consists of more than 100 funds.  Through their  jointly-owned  subsidiary,  The
Vanguard Group, Inc. (Vanguard),  the Trust and the other Trusts in The Vanguard
Group   obtain   at  cost   virtually   all  of  their   corporate   management,
administrative,  and distribution  services.  Vanguard also provides  investment
advisory services on an at-cost basis to certain Vanguard funds.

     Vanguard  employs  a  supporting  staff of  management  and  administrative
personnel  needed  to  provide  the  requisite  services  to the  funds and also
furnishes the funds with  necessary  office space,  furnishings,  and equipment.
Each fund pays its share of Vanguard's  net expenses  which are allocated  among
the funds under methods  approved by the Board of each fund.  In addition,  each
fund bears its own direct expenses such as legal, auditing and custodian fees.

     The funds' officers are also officers and employees of Vanguard. No officer
or employee owns, or is permitted to own, any securities of any external adviser
for the funds.


     Vanguard  and the Fund has  adopted a Code of Ethics  designed  to  prevent
employees  who may have  access  to  nonpublic  information  about  the  trading
activities of the Fund (access  persons) from profiting  from that  information.
The Code permits  access persons to invest in securities for their own accounts,
including  securities  that may be held by the Fund, but places  substantive and
procedural  restrictions  on their  trading  activities.  For example,  the Code
requires  that access  persons of the Fund  receive  advance  approval for every
securities trade to ensure that there is no conflict with the trading activities
of the Fund.


     Vanguard was  established  and operates  under a Funds'  Service  Agreement
which was approved by the  shareholders of each of the funds.  The amounts which
each of the  funds  has  invested  are  adjusted  from  time to time in order to
maintain the proportionate  relationship between each fund's relative net assets
and its  contribution  to Vanguard's  capital.  The Amended and Restated  Funds'
Service Agreement provides for the following arrangement: (1) each Vanguard

                                      B-13
<PAGE>

fund may be called  upon to invest a maximum of 0.40% of its assets in  Vanguard
and (2) there is no restriction on the maximum cash investment that the Vanguard
funds may make in Vanguard.  At December 31, 1999,  the Balanced  Index Fund had
contributed  capital of $595,000 to Vanguard,  representing  0.02% of the Fund's
net assets and 0.60% of Vanguard's capitalization.

     MANAGEMENT.  Corporate management and administrative  services include: (1)
executive  staff;  (2) accounting and financial;  (3) legal and regulatory;  (4)
shareholder  account  maintenance;  (5)  monitoring  and  control  of  custodian
relationships;  (6)  shareholder  reporting;  and (7) review and  evaluation  of
advisory and other services provided to the funds by third parties.

     DISTRIBUTION.  Vanguard Marketing Corporation, a wholly-owned subsidiary of
The Vanguard Group, Inc., provides all distribution and marketing activities for
the funds in the Group. The principal distribution expenses are for advertising,
promotional materials,  and marketing personnel.  Distribution services may also
include  organizing  and offering to the public,  from time to time, one or more
new investment companies which will become members of Vanguard. The Trustees and
officers of Vanguard  determine the amount to be spent annually on  distribution
activities,  the  manner and  amount to be spent on each  fund,  and  whether to
organize new investment companies.

     One half of the distribution expenses of a marketing and promotional nature
is allocated  among the funds based upon relative net assets.  The remaining one
half of those expenses is allocated among the funds based upon each fund's sales
for the preceding 24 months relative to the total sales of the funds as a group,
provided,  however,  that no funds aggregate  quarterly rate of contribution for
distribution expenses of a marketing and promotional nature shall exceed 125% of
average  distribution  expense rate for  Vanguard,  and that no fund shall incur
annual distribution  expenses in excess of 20/100 of 1% of its average month-end
net assets.

     During the fiscal years ended  December 31, 1997,  1998, and 1999, the Fund
incurred the following  approximate  amounts of The Vanguard Group's  management
(including  transfer agency)  distribution,  and marketing  expenses:  $974,000,
$1,715,000, and $4,542,000, respectively.

INVESTMENT ADVISORY SERVICES

Vanguard provides  investment  advisory services to the Fund. These services are
provided on an at-cost basis from a money management staff employed  directly by
Vanguard.  The  compensation  and other  expenses  of this staff are paid by the
funds and funds utilizing these services. During the fiscal years ended December
31, 1997, 1998, and 1999, the Fund paid  approximately  $80,000,  $123,000,  and
$205,000,  respectively,  of Vanguard's expenses relating to investment advisory
services.


TRUSTEE COMPENSATION

The  same  individuals  serve  as  Trustees  of all  Vanguard  funds  (with  two
exceptions,  which are noted in the table appearing on page B-15), and each fund
pays a proportionate share of the Trustees' compensation. The funds employ their
officers on a shared  basis,  as well.  However,  officers  are  compensated  by
Vanguard, not the funds.

     INDEPENDENT TRUSTEES. The funds compensate their independent Trustees--that
is, the ones who are not also officers of the Fund--in three ways:

- -    The  independent  Trustees  receive an annual fee for their  service to the
     funds, which is subject to reduction based on absences from scheduled Board
     meetings.
- -    The  independent  Trustees are reimbursed for the travel and other expenses
     that they incur in attending Board meetings.
- -    Upon retirement,  the independent  Trustees receive an aggregate annual fee
     of  $1,000  for each year  served  on the  Board,  up to  fifteen  years of
     service.  This annual fee is paid for ten years  following  retirement,  or
     until each Trustee's death.

                                      B-14
<PAGE>

     "INTERESTED"  TRUSTEE.  Mr. Brennan serves as a Trustee, but is not paid in
this  capacity.  He is,  however,  paid in his role as officer  of The  Vanguard
Group, Inc.

  COMPENSATION TABLE. The following table provides compensation details for each
of the  Trustees.  We list the  amounts  paid as  compensation  and  accrued  as
retirement benefits by the Fund for each Trustee.  In addition,  the table shows
the total  amount of benefits  that we expect each  Trustee to receive  from all
Vanguard funds upon  retirement,  and the total amount of  compensation  paid to
each Trustee by all Vanguard funds.


                                         VANGUARD BALANCED INDEX FUND
                                         TRUSTEES' COMPENSATION TABLE

<TABLE>
<CAPTION>
<S>                                              <C>             <C>            <C>                 <C>
                                                                PENSION OR
                                                                RETIREMENT                          TOTAL
                                                                 BENEFITS                        COMPENSATION
                                               AGGREGATE        ACCRUED AS       ESTIMATED         FROM ALL
                                              COMPENSATION     PART OF THIS       ANNUAL           VANGUARD
                                               FROM THIS          FUND'S       BENEFITS UPON     FUNDS PAID TO
  NAMES OF TRUSTEES                             FUND(1)        EXPENSES(1)      RETIREMENT        TRUSTEES(2)
- ---------------------------------------------------------------------------------------------------------------
John C. Bogle (3)                                None             None               None              None
John J. Brennan                                  None             None               None              None
JoAnn Heffernan Heisen                           $439              $24            $15,000           $80,000
Bruce K. MacLaury                                $457              $42            $12,000           $75,000
Burton G. Malkiel                                $443              $40            $15,000           $80,000
Alfred M. Rankin, Jr.                            $439              $29            $15,000           $80,000
John C. Sawhill                                  $439              $37            $15,000           $80,000
James O. Welch, Jr.                              $439              $43            $15,000           $80,000
J. Lawrence Wilson                               $439              $31            $15,000           $80,000
</TABLE>

(1)  The amounts  shown in this column are based on the Fund's fiscal year ended
     December 31, 1999.
(2)  The amounts reported in this column reflect the total  compensation paid to
     each  Trustee  for his or her  service  as Trustee of 103 funds (102 in the
     case of Mr. Malkiel;  93 in the case of Mr. MacLaury) for the 1999 calendar
     year.

(3)  Mr. Bogle retired from the Fund's Board on December 31, 1999.



                             PORTFOLIO TRANSACTIONS

In placing portfolio transactions, Vanguard uses its best judgment to choose the
broker most capable of providing the brokerage  services necessary to obtain the
best available price and most favorable execution. The full range and quality of
brokerage services available are considered in making these  determinations.  In
those instances where it is reasonably  determined that more than one broker can
offer the brokerage  services needed to obtain the best available price and most
favorable  execution,  consideration will be given to those brokers which supply
statistical  information  and provide  other  services in addition to  execution
services to the Fund.

     The Fund's  bond  investments  are  generally  purchased  and sold  through
principal transactions,  meaning that the Fund normally purchases bonds directly
from the issuer or a primary market-maker acting as principal for the bonds on a
net basis.  Explicit brokerage  commissions are not paid on these  transactions,
although  the  purchase   price  for  bonds  usually   includes  an  undisclosed
compensation.   Purchases  from   underwriters  of  bonds  typically  include  a
commission or concession  paid by the issuer to the  underwriter,  and purchases
from  dealers  serving as market  makers  typically  include a dealer's  mark-up
(i.e., a spread between the bid and the asked prices).

     The Vanguard  Group  chooses  brokers or dealers to handle the purchase and
sale of the Fund's  bonds,  and is  responsible  for getting the best  available
price and most favorable execution for all

                                      B-15
<PAGE>

transactions.  When the Fund  purchases a newly  issued  bond at a fixed  price,
Vanguard may designate certain members of the underwriting  syndicate to receive
compensation  associated with that  transaction.  Certain dealers have agreed to
rebate  a  portion  of such  compensation  directly  to the Fund to  offset  its
management  expenses.  Vanguard  is  required  to  seek  best  execution  of all
transactions and is not authorized to pay a higher brokerage  commission  solely
on account of the receipt of research or other services.


     The Fund's adviser evaluates the  reasonableness of any commissions paid by
considering:   (a)   historical   commission   rates;   (b)  rates  which  other
institutional  investors are paying, based upon publicly available  information;
(c)  rates  quoted  by  brokers  and  dealers;  (d)  the  size  of a  particular
transaction,  in terms of the number of  shares,  dollar  amount,  and number of
clients  involved;  (e) the  complexity of a particular  transaction in terms of
both  execution and  settlement;  (f) the level and type of business done with a
particular firm over a period of time; and (g) the extent to which the broker or
dealer has  capital at risk in the  transaction.  During the fiscal  years ended
December  31,  1997,  1998,  and  1999,  the Fund  paid  approximately  $70,745,
$139,894, and $141,882 in brokerage commissions, respectively.



                              FINANCIAL STATEMENTS

The Fund's financial  statements as of and for the year ended December 31, 1999,
appearing  in  the  Vanguard   Balanced  Index  Fund's  1999  Annual  Report  to
Shareholders,  and the report thereon of PricewaterhouseCoopers LLP, independent
accountants,  also  appearing  therein,  are  incorporated  by reference in this
Statement of  Additional  Information.  For a more  complete  discussion  of the
performance,  please see the Fund's Annual Report to Shareholders,  which may be
obtained without charge.


                              COMPARATIVE INDEXES

Each of the investment company members of The Vanguard Group, including Vanguard
Balanced  Index Fund,  may from time to time,  use one or more of the  following
unmanaged indexes for comparative performance purposes.

STANDARD & POOR'S 500 COMPOSITE STOCK PRICE  INDEX--includes  stocks selected by
Standard & Poor's  Index  Committee  to  include  leading  companies  in leading
industries and to reflect the U.S. stock market.

STANDARD & POOR'S  MIDCAP 400  INDEX--is  composed of 400 medium sized  domestic
stocks.

STANDARD & POOR'S 500/BARRA VALUE  INDEX--consists of the stocks in the Standard
& Poor's 500 Composite Stock Price Index (S&P 500) with the lowest price-to-book
ratios, comprising 50% of the market capitalization of the S&P 500.

STANDARD & POOR'S  SMALLCAP  600/BARRA VALUE  INDEX--contains  stocks of the S&P
SmallCap 600 Index which have a lower than average price-to-book ratio.

STANDARD & POOR'S SMALLCAP  600/BARRA GROWTH  INDEX--contains  stocks of the S&P
SmallCap 600 Index which have a higher than average price-to-book ratio.

RUSSELL  1000  VALUE  INDEX--consists  of the stocks in the  Russell  1000 Index
(comprising  the 1,000  largest  U.S.-based  companies  measured by total market
capitalization)  with the lowest  price-to-book  ratios,  comprising  50% of the
market capitalization of the Russell 1000.

WILSHIRE  5000 TOTAL MARKET  INDEX--consists  of more than 7,000  common  equity
securities,  covering  all  stocks  in the  U.S.  for  which  daily  pricing  is
available.

WILSHIRE  4500  COMPLETION  INDEX--consists  of all stocks in the Wilshire  5000
except for the 500 stocks in the Standard and Poor's 500 Index.

RUSSELL 3000 STOCK INDEX--a diversified  portfolio of approximately 3,000 common
stocks  accounting for over 90% of the market value of publicly traded stocks in
the U.S.

                                      B-16
<PAGE>

RUSSELL 2000 STOCK INDEX--a subset of approximately 2,000 of the smallest stocks
contained in the Russell 3000, a widely-used  benchmark for small capitalization
common stocks.

MORGAN  STANLEY  CAPITAL  INTERNATIONAL  EAFE  INDEX--is an  arithmetic,  market
value-weighted  average of the performance of over 900 securities  listed on the
stock exchanges of countries in Europe, Australasia, and the Far East.

GOLDMAN SACHS 100  CONVERTIBLE  BOND  INDEX--currently  includes 71 bonds and 29
preferreds.   The  original  list  of  names  was  generated  by  screening  for
convertible  issues of $100  million or greater  in market  capitalization.  The
index is priced monthly.

SALOMON BROTHERS GNMA  INDEX--includes  pools of mortgages originated by private
lenders and guaranteed by the mortgage pools of the Government National Mortgage
Association.

SALOMON BROTHERS HIGH-GRADE  CORPORATE BOND  INDEX--consists of publicly issued,
non-convertible  corporate bonds rated Aa or Aaa. It is a value-weighted,  total
return index, including  approximately 800 issues with maturities of 12 years or
greater.


LEHMAN BROTHERS  LONG-TERM  TREASURY BOND INDEX--is a market weighted index that
contains individually priced U.S. Treasury securities.


MERRILL LYNCH  CORPORATE & GOVERNMENT  BOND  INDEX--consists  of over 4,500 U.S.
Treasury, agency and investment grade corporate bonds.


LEHMAN BROTHERS  CORPORATE (BAA) BOND INDEX--all  publicly  offered  fixed-rate,
nonconvertible  domestic  corporate bonds rated Baa by Moody's,  with a maturity
longer  than one year and with more than $100  million  outstanding.  This index
includes over 1,500 issues.

LEHMAN  BROTHERS  LONG-TERM  CORPORATE  BOND  INDEX--is  a subset of the  Lehman
Brothers   Corporate  Bond  Index  covering  all  corporate,   publicly  issued,
fixed-rate,  nonconvertible  U.S.  debt issues rated at least Baa, with at least
$100 million principal outstanding and maturity greater than ten years.


BOND BUYER  MUNICIPAL BOND INDEX--is a yield index on current coupon  high-grade
general obligation municipal bonds.

STANDARD & POOR'S PREFERRED INDEX--is a yield index based upon the average yield
for four high-grade, non-callable preferred stock issues.

NASDAQ INDUSTRIAL INDEX--is composed of more than 3,000 industrial issues. It is
a  value-weighted  index  calculated  on price  change only and does not include
income.

COMPOSITE  INDEX--70%  Standard  & Poor's  500 Index and 30%  NASDAQ  Industrial
Index.


COMPOSITE  INDEX--65%  Standard  & Poor's  500  Index  and 35%  Lehman  Brothers
Long-Term Corporate AA or Better Bond Index.

COMPOSITE INDEX--65% Lehman Brothers Long-Term Corporate AA or Better Bond Index
and a 35% weighting in a blended  equity  composite (75% Standard & Poor's/BARRA
Value Index, 12.5% Standard & Poor's Utilities Index and 12.5% Standard & Poor's
Telephone Index).


LEHMAN BROTHERS  LONG-TERM  CORPORATE AA OR BETTER BOND  INDEX--consists  of all
publicly    issued,    fixed    rate,     nonconvertible    investment    grade,
dollar-denominated, SEC-registered corporate debt rated AA or AAA.

LEHMAN BROTHERS  AGGREGATE BOND INDEX--is a market-weighted  index that contains
individually priced U.S. Treasury,  agency, corporate, and mortgage pass-through
securities  corporate rated Baa- or better. The Index has a market value of over
$5 trillion.

LEHMAN  BROTHERS  CORPORATE A OR BETTER  BOND  INDEX--consists  of all  publicly
issued,  investment  grade  corporate  bonds rated A or better,  of all maturity
levels.

LEHMAN  BROTHERS  MUTUAL  FUND  SHORT  (1-5)  GOVERNMENT/CORPORATE  INDEX--is  a
market-weighted index that contains  individually priced U.S. Treasury,  agency,
and corporate

                                      B-17
<PAGE>

investment grade bonds rated BBB- or better with maturities between one and five
years. The index has a market value of over $1.6 trillion.

LEHMAN BROTHERS MUTUAL FUND INTERMEDIATE (5-10) GOVERNMENT/CORPORATE INDEX--is a
market-weighted index that contains  individually priced U.S. Treasury,  agency,
and corporate  securities rated BBB- or better with maturities  between five and
ten years. The index has a market value of over $800 billion.

LEHMAN  BROTHERS  LONG (10+)  GOVERNMENT/CORPORATE  INDEX--is a  market-weighted
index that contains  individually  priced U.S.  Treasury,  agency, and corporate
securities rated BBB-or better with maturities greater than ten years. The index
has a market value of over $1.1 trillion.

LIPPER SMALL  COMPANY  GROWTH FUND  AVERAGE--the  average  performance  of small
company  growth funds as defined by Lipper Inc.  Lipper  defines a small company
growth  fund as a fund that by  prospectus  or  portfolio  practice,  limits its
investments  to companies on the basis of the size of the company.  From time to
time,  Vanguard may advertise using the average  performance  and/or the average
expense ratio of the small company  growth funds.  (This fund category was first
established  in 1982.  For years prior to 1982,  the results of the Lipper Small
Company  Growth  category  were  estimated  using the  returns of the Funds that
constituted the Group at its inception.)

LIPPER BALANCED FUND  AVERAGE--an  industry  benchmark of average balanced funds
with similar investment objectives and policies, as measured by Lipper Inc.

LIPPER  NON-GOVERNMENT  MONEY  MARKET FUND  AVERAGE--an  industry  benchmark  of
average non-government money market funds with similar investment objectives and
policies, as measured by Lipper Inc.

LIPPER  GOVERNMENT MONEY MARKET FUND AVERAGE--an  industry  benchmark of average
government money market funds with similar  investment  objectives and policies,
as measured by Lipper Inc.

LIPPER GENERAL EQUITY FUND  AVERAGE--an  industry  benchmark of average  general
equity funds with similar  investment  objectives  and policies,  as measured by
Lipper Inc.

LIPPER FIXED-INCOME FUND AVERAGE--an  industry benchmark of average fixed-income
funds with similar  investment  objectives  and policies,  as measured by Lipper
Inc.

                                      B-18
<PAGE>

                    APPENDIX A--DESCRIPTION OF BOND RATINGS

Excerpts from Moody's Investors Service, Inc. description of its four highest
preferred bond ratings:

     AAA--Judged  to be the best  quality.  They  carry the  smallest  degree of
investment risk.

     AA--Judged  to be of high quality by all  standards.  Together with the Aaa
group they comprise what are generally known as high grade bonds.

     A--Possess many favorable investment attributes and are to be considered as
"upper medium grade obligations".

     BAA--Considered as medium grade obligations;  i.e., they are neither highly
protected nor poorly secured.  Interest  payments and principal  security appear
adequate for the present but certain  protective  elements may be lacking or may
be characteristically  unreliable over any great length of time. Such bonds lack
outstanding   investment   characteristics   and  in   fact   have   speculative
characteristics as well.

     Moody's  also  supplies  numerical   indicators  1,  2,  and  3  to  rating
categories.  The modifier 1 indicates  that the security is in the higher end of
its rating  category;  the  modifier 2  indicates  a  mid-range  ranking;  and 3
indicates a ranking toward the lower end of the category.

     Excerpts from Standard & Poor's Corporation description of its four highest
stock ratings:

     AAA--Highest  grade  obligations.   Capacity  to  pay  interest  and  repay
principal is extremely strong.

     AA--Also qualify as high grade  obligations,  a very strong capacity to pay
interest and repay principal and differs from AAA issues only in small degree.

     A--Regarded  as upper  medium  grade.  They have a strong  capacity  to pay
interest and repay principal  although they are somewhat more susceptible to the
adverse effects of changes in circumstances and economic conditions than debt in
higher rated categories.

     BBB--Regarded  as having an  adequate  capacity to pay  interest  and repay
principal. Whereas it normally exhibits adequate protection parameters,  adverse
economic  conditions  or  changing  circumstances  are more  likely to lead to a
weakened  capacity to pay interest and repay principal for debt in this category
than in higher rated  categories.  This group is the lowest which  qualifies for
commercial bank investment.

     Standard & Poor's  applies  indicators  "+",  no  character  and "-" to its
rating categories. The indicators show relative standing within the major rating
categories.


                                      B-19
<PAGE>

                                                           SAI002-BALANCED INDEX

                                      B-20


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